marc n
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| posted on 25/4/09 at 06:45 PM |
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MNR new reverse / Bec reverse unit / myths
hi all as some of you may know we have been developing a reverse box, we did do the electirc reverse for a while which was a big positive in terms of
power saved , and noise saved but unless you live somewhere with no hills / have a large battery they are just not powerfull enough to be fully
practical, as a way to satisfy the scrutineers at racing they are adaquate, but for a real useable car its been niggling me for a while that there is
a market for an inline varient that does not either sap power, rattle , clank, spit oil out, or cost a fortune, now that a reverse is a must it was
time to take action!!!!!!!!
im pleased to announce we may have cracked it 
today we ran our inline reverse box for the first time on the rolling road in a back to back test a very big thankyou to damien at daytuner
performance for helping us and as usual being very accomadating and helpfull
test details
test 1
mnr vortx with 03 r1 engine with a popular unit used max power 127.03 at rear wheels 15.56 % power loss through drivetrain, 18 degrees backlash on
unit
test 2
mnr vortx with 03 r1 engine with our unit used max power 132.28 at rear wheels 11.63 % power loss through drivetrain, 1 degree backlash on unit
both done on same day with 4th gear used for testing
to say im pleased is an understatement if i wasnt working tomorrow would be out celebrating
we will have the actual unit on display at stoneleigh with the power graphs for all to see 
and the best part is that it is going to retail at £499
many thanks to iain b on here and his brother for the the use of their car, damien at daytuner and our technical partners who have made this
possible
cheers
marc
edit to add sorry you got soaked on the way back iain when i felt it go a bit cold i turned up the heater a bit and when it pissed down i put my
wipers on in the support vehicle
[Edited on 25/4/09 by marc n]
please email rather than u2u
direct workshop email ( manned 8am till 6pm )
www.mnrltd.co.uk enquireys to :-
chrismnrltd@btinternet.com
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Steve Hignett
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| posted on 25/4/09 at 06:49 PM |
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Great to hear it Marc, and I think the price is a fair old crack too.
Shame you didn't have a spare full prop to be able to give it a spin up with neither of them fitted!
Steve
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marc n
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| posted on 25/4/09 at 07:02 PM |
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did wonder that myself steve but 99.9 % sure that there is genuinely no difference, when you spin our unit by hand it free spins for ages, the
bearings we have used are real pukka bits of kit and are rated at twice the rpm that they will see at top rpm in top gear at 150 mph if you can
achieve it
also anyone with a centre bearing style prop will also be aware of the slight slop present when going on and off the power due to the rubber mount
this is not evident at all on the new unit
weight wise its the same as a popular brand, and is 1.7 kg heavier than an electric version ( using a small bike starter motor and ring gear on the
rear prop flange ) with a small bike battery or lighter than an electric version with a high power gel battery ( that means you can reverse without
having to rev to 8k to stop the engine stalling due to current drain when reversing )
and its definately lighter than using a car starter motor
installation wise its smaller than most, so can be mounted further down the transmission tunnel meaning it is possible to have equal length front and
rear propshafts, helping with universal joint angles and i dare say even less of a power sap with better angles on shafts, the car we used as the test
bed has a much longer rear prop than front approx 850mm rear 430mm front so maybe we may see more power gains mid mounted ???
any questions fire away
cheers
marc
[Edited on 25/4/09 by marc n]
please email rather than u2u
direct workshop email ( manned 8am till 6pm )
www.mnrltd.co.uk enquireys to :-
chrismnrltd@btinternet.com
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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marc n
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| posted on 25/4/09 at 07:08 PM |
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i was suprised to see that the popular unit used didnt sap as much power as has been mentioned before on here, for referance the standard the bike
loses 7 % through the chain from memory but will confirm on monday
appologies for all the posts , but as you can tell im well chuffed
cheers
marc
please email rather than u2u
direct workshop email ( manned 8am till 6pm )
www.mnrltd.co.uk enquireys to :-
chrismnrltd@btinternet.com
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smart51
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| posted on 25/4/09 at 07:08 PM |
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So the "popular unit" wastes 5 BHP at peak power more than yours. It must get quite warm then.
£499 is still quite a lot but its a lot better than the one I looked at when building mine. Now that reverse is mandatory, you should sell quite a
few. Well done.
[Edited on 25-4-2009 by smart51]
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daniel mason
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| posted on 25/4/09 at 07:10 PM |
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thats great news marc! any closer with my gear shift problem?
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marc n
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| posted on 25/4/09 at 07:14 PM |
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as far as im aware all the units available at present constantly drive a chain when going forwards meaning 4 driven bearings as opposed to our two and
use drive dogs ( as per a gearbox when going forward ) hence the backlash
temps where noticably lower ( very noticeably lower ) just by touching the casing
we ran a small baffled breather pipe with a 2mm outlet ( modified grease nipple ) and could not feel any pressure build up at all
cheers
marc
please email rather than u2u
direct workshop email ( manned 8am till 6pm )
www.mnrltd.co.uk enquireys to :-
chrismnrltd@btinternet.com
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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marc n
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| posted on 25/4/09 at 07:18 PM |
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yep have the paddles now mounted to column tube ( to please sva man ) and spaced correctly so you can use them ( as std the setup runs with a much
smaller wheel than yours meaning you couldnt even touch the paddles when we first fitted it ) i have managed to not modify the original parts supplied
and have made new parts so you could still have the paddles rotating with the wheel as they are designed
cheers
marc
please email rather than u2u
direct workshop email ( manned 8am till 6pm )
www.mnrltd.co.uk enquireys to :-
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bassett
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| posted on 25/4/09 at 07:18 PM |
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Hi Marc sounds like a great box you've built there. For MNR owners without a reverse box(with centre bearing on welded in platform) how
easy/hard is this going to be to fit and would it just need new prop shafts or any other modifications?
Cheers
Adam
My MNR Blog Updated Jan 2010 - Track Day Prep Begins!
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marc n
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| posted on 25/4/09 at 07:21 PM |
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obviously apart from the new propshafts it will require four holes drilling in the plate you mention, and in some cases a small adapter plate so no
real problems at all, it is also a direct replacement dimension wise to other units available with no propshaft alterations needed if you have
previously had a reverse fitted
cheers
marc
please email rather than u2u
direct workshop email ( manned 8am till 6pm )
www.mnrltd.co.uk enquireys to :-
chrismnrltd@btinternet.com
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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slimtater
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| posted on 25/4/09 at 07:24 PM |
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Sounds a great development - is this the official group buy thread? 
http://www.picturetrail.com/sfx/album/view/19919222
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marc n
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| posted on 25/4/09 at 07:29 PM |
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weight wise we could save a bit as the casing is at the moment a square block and can be sculpted to save a little plus the lever mech is at present
all steel and a bit bulky so i reckon we could lose .5 kg yet
cheers
marc
please email rather than u2u
direct workshop email ( manned 8am till 6pm )
www.mnrltd.co.uk enquireys to :-
chrismnrltd@btinternet.com
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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iain b
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| posted on 25/4/09 at 08:50 PM |
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my back-up
my car was fitted today with the reverse box.i drove it to the daytuners rolling road.this was after running my car this morning with on the rollers
with my existing box.the differance in just the drive of the car is astonishing..... the car has no drive train noise in forward gear and the clunck u
get from off throttle to back to power down does not exist...the car felt and drove so different ..i can only say this must be the way
forward..........see u all at the show.........iain..
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iain b
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| posted on 25/4/09 at 09:05 PM |
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im first
just to let u all know the first one has ......MY NAME ON IT ....so fight it out between yourselves for number 2
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thegasmen
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| posted on 25/4/09 at 09:38 PM |
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reverse box
Hi Ian
Not bad figures there at daytuner i was down there a month ago with the dax gets kind of frightening when he takes it to 11000 revs you think the car
wants to get through the door with it just ballancing on that single roller.
Regards Mick
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bobs bangers
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| posted on 25/4/09 at 09:57 PM |
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reverse
Well done Chris & Marc !
will it bolt in place of my quaife ?
I would be very keen to see how much smoother these are .
look forward to more info.
Regards
Robert
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smart51
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| posted on 26/4/09 at 06:23 AM |
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quote:
Originally posted by bobs bangers
will it bolt in place of my quaife ?
Making the case so it had the same mounting points as the quaife would be no bad thing. Making it a drop in replacement in terms of size would
probably do your sales figures no harm
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ReMan
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| posted on 26/4/09 at 07:53 AM |
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I think that has been covered with reference to the "popular unit"
How many other popular units are there?
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richardh
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| posted on 26/4/09 at 09:01 AM |
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that is good news. the noise from my "popular unit" is a bit harsh making me check the fluid level every time i'm out.
well done guys
Time for a change!
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iain b
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| posted on 26/4/09 at 04:54 PM |
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hi iain here .probably just before marc but here goes......yes the popular box is as above mentioned...i have one fitted in my car ...it took myself
and mark only an hour to change the boxes around.it does mount EXACTLY.. to your old mounting points,and to your existing propshaft..........i must
just add again my car sounded and drove so well it felt wierd....no clunk/bang or back lash from the prop.again if it did not have to come back out so
it can be at the show mnr would not get it back(mine is on order)
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Krismc
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| posted on 26/4/09 at 08:15 PM |
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One of the reasons i didnt get a bike engine has been solved- Well done sounds really positive
Next thing and only thing left marc is too make your own engine.
Built, Ivaed, Drove and now Sold - 2011 MNR VORTX RT+ 2000cc Zetec on R1 Throttle boddies.
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iain b
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| posted on 26/4/09 at 08:39 PM |
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WACTH THIS SPACE!!!!!!!!!!
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iain b
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| posted on 26/4/09 at 08:40 PM |
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and learn to spell
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eznfrank
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| posted on 27/4/09 at 12:39 PM |
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So, my wquestion is, for those of us who literally want to keep IVA man happy and have no real interst in going backwards per se, are there any of the
older units now going cheap?
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eznfrank
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| posted on 27/4/09 at 01:12 PM |
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Yeah, I guess so, basically I just want something to keep the IVA man quiet and also to go backwards about two feet to get my car onto the slope to
roll out of the garage. Just looking for the cheapest option really. Probably a starter motor with a ring gear I guess but my fabrication skills are
garbage so looking for off the shelf.
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