When i vent my anger into my loud pedal, my engine gets very hot and and i need a vent at back of bonnet too let off some steam, can some one think
off a good shape? here is the bonnet, i cant photoshop for the life of me, was going to put a long vent at back off bonnet but ive got 2 humps
there...
Oh and before you ask, ive opened up the vent at the front so the cold air rushes over the top of engine.
carbonmods NACA duct on backwards?
I think there are loads of options on shape, finish and position.
It think its really up to you and what look you like.
Why not solve the problem of overheating?
Kris, is your engine plumbing correct? or, is the same as when it last burned you?
I suspect you haven't corrected the bypass pipe yet?
A couple of side vents would do the job efficiently rather than one on top. The bonnet scoop is more of an ornament than anything, most of the air under your bonnet is coming in through the radiator grille and going out under the floor or down the transmission tunnel.
quote:
Originally posted by coozer
Kris, is your engine plumbing correct? or, is the same as when it last burned you?
I suspect you haven't corrected the bypass pipe yet?
I'd suggest side ones too, another top one would just mean the air would pass over the top where if you put the exit vents low on the sides it has to move that way.
Surely, plenty of air coming in via rad would force enough air up over, dont want to weaken bonnet too much, althought i could just add a 50mm round
hole too either side.
[Edited on 26/3/11 by Krismc]
I would guess that vent on the top of the bonnet is too small to do anything except make a whistling noise 
You need to plumb the bypass into the bottom hose, away from the headtank, put the stat back in with a 5mm hole drilled in it.
Get shot of the raceline (they are rubbish!) and put the oem themo bit back on.
And, where is the bleeding pipes?? You have it plumbed up wrong mate!
Is the radiator fully ducted inside the nosecone?
ie. does all the air that goes into the nose have to go through the rad?
A duct in the top of the nosecone might let more heat out than a bonnet duct.
Is the rise in temp being kept in check by the fan or is it actually getting near to boiling over?
Have you considered wrapping the exhaust to reduce the underbonnet temp?
Geoff
Ive also been told not too use the side connection on the raceline waterail, due too the temp differance.
you will have to Show me a diagram off what you mean
...here is how its plumbed.
I've got vents at the rear of the sides of the bonnet as well as a scoop/inlet vent similar to yours (needed to clear the engine) and have no problem with engine temp. Having vents in the sides, rather than on top of the bonnet, has the added advantage of not spraying you in the face with boiling coolant if a hose comes off (guess how I found out?)
Refit the original thermo housing and add a bleed pipe from air bleed on housing to the header tank, also take a hose from the heater outlet on
exhaust side of housing and connect to the water pump near the connection with the bottom hose where you have one from the header tank at present.
Mine is plumbed like this and always runs at a nice steady 85 to 90 deg , I have also heard lots of people have problems with the raceline set up.
Paul
quote:
Originally posted by Krismc
...here is how its plumbed.
Some pics here:
http://www.locostbuilders.co.uk/viewthread.php?fid=4&tid=115155
quote:
Originally posted by Humbug
I've got vents at the rear of the sides of the bonnet as well as a scoop/inlet vent similar to yours (needed to clear the engine) and have no problem with engine temp. Having vents in the sides, rather than on top of the bonnet, has the added advantage of not spraying you in the face with boiling coolant if a hose comes off (guess how I found out?)
quote:
Originally posted by Steve Hignett
Some pics here:
http://www.locostbuilders.co.uk/viewthread.php?fid=4&tid=115155
I like these.......................
so how about thism but only on my exhaust side for now, see if the heat is lower........................
or even
[Edited on 27/3/11 by Krismc]
Kris,
Check out the pics of my old MNR in my photo archive. Had a similar problem to you but nose vent helped to reduce the temperatures. The radiator fan
was also on a manual switch so when you were sitting in traffic you could put the fan on to keep temps down.
I would suggest side vents rather than top. If/when the rad hose pops off, you won't get how anti-freeze all over your helmet
Guess how i
found out.
ATB Dan.
Here is what i managed today, saying as my dremel isnt playing ive had too do it the old school way, while sitting on front lawn with all passers by
watching. well it was such a nice day.
I decided too go with slots, so i drilled 4 holes, cut between them and filed and sanded by hand until i achieved a decent result, i dont have much
silaflex so i just did the exhaust side for now, looks alright i think.
Nice work!
What would look really cool is if you cut two pieces of 3 mm hardboard, one the same shape as the cut outs but just a bit smaller, and the other with
the same shape/size hole as the bonnet holes cut into it. Then put your piece of (ally, I presume) mesh between them on a firm surface and
press/hammer the smaller piece down until it is flush with the other, which will give you a joggled edge on the mesh, and let the mesh sit flush with
the outside face of the bonnet.
You might have to experiment a bit with the clearances between the wood bits to get a nice result.
Cheers
Fred W B
[Edited on 27/3/11 by Fred W B]
Now you tell me, I've just glued them in ha ha.
Nice work Kris,looks like it was meant to be there.
I agree with Steve on the water rail mind,get rid of it and
fit an oem thermostat housing.
Then fit a bypass hose,it will solve any cooling problems mate.
Andy
quote:
Originally posted by Krismc
Now you tell me, I've just glued them in ha ha.
Problems with vent in the bonnet in my oppinion are if you do have a boil over and it decides to vent theres a good chance of hot water in the face/ I opened the sides up on mine to allow heat out low down
quote:
Originally posted by austin man
Problems with vent in the bonnet in my oppinion are if you do have a boil over and it decides to vent theres a good chance of hot water in the face/ I opened the sides up on mine to allow heat out low down
Update........
Plumbed like this
Now i just need one of these welded.........
Onto this long silver section of pipe in the drawing?
[Edited on 29/3/11 by Krismc]