nib1980
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| posted on 30/11/07 at 09:48 AM |
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What Power?
HI all,
Just a quick question, what is the rough BHP output of a 750mc race spec 1300 xflow?
just wonder as I think I have got one.
mind you i've switched it to twin 40's and electronic ignition now?
what can I expect BHP wise and is it worth upgrading the engine? I'm NOT have a BEC!
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brynhamlet
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| posted on 30/11/07 at 09:55 AM |
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I don’t know about the 1300cc version, but I’ve got a 1600cc X-flow. The short engine is a Formula Ford version which is bored to 1800cc with a gas
flowed head and a pair of twin Dellorto’s and a piper fast road cam.
Engine builder assures me that when its run in it will be about 145BHP if that’s any help.
Yours is probably 20BHP less if it’s a full race engine.
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fesycresy
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| posted on 30/11/07 at 09:56 AM |
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I seem to remember figures between 88 and 92 for a race spec Randall engine.
u2u Procomp.
HTH.
Lyn.
-----------------------------------------------------------------------------------------------------
The sooner you fall behind, the more time you'll have to catch up.
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procomp
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| posted on 30/11/07 at 09:57 AM |
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Hi Hold on to your seat. It's roughly a whole 90bhp at the fly wheel  . Thats with the original downdraft carb and in GT spec.
It's amazing what so little BHP can do when you compare it to all the big BHP cars ect on these trackdays .
Cheers Matt
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nib1980
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| posted on 30/11/07 at 10:06 AM |
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quote:
Originally posted by procomp
Hi Hold on to your seat. It's roughly a whole 90bhp at the fly wheel . Thats with the original downdraft carb and in GT spec.
It's amazing what so little BHP can do when you compare it to all the big BHP cars ect on these trackdays .
Cheers Matt
cool, thats sounds great, I'll get it down a rolling road sometime and find out for sure!
are the webbers and megajolt likely to make a major diffrerance?
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procomp
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| posted on 30/11/07 at 10:49 AM |
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Hi the megajolt will clean the ignition up a bit. And the webbers will give a bit more mid range power but will not make a huge difference to the top
end maybe just 10 or so max.
Cheers Matt
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IndyJohn
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| posted on 30/11/07 at 11:19 AM |
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a good exhaust system will help LOADS
john
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TimC
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| posted on 30/11/07 at 11:52 AM |
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quote:
Originally posted by procomp
It's amazing what so little BHP can do when you compare it to all the big BHP cars ect on these trackdays .
Matt, your record is stuck again!
I'm just kidding mate!
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02GF74
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| posted on 30/11/07 at 11:55 AM |
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my guesstimate: a tuned 1600 would optimisically give 140 so roughly a 1300 would be 13/16 of that 110.
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MikeRJ
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| posted on 30/11/07 at 12:03 PM |
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quote:
Originally posted by procomp
Hi Hold on to your seat. It's roughly a whole 90bhp at the fly wheel . Thats with the original downdraft carb and in GT spec.
That's very good considering the very limited amount of work that is permitted on them, and with only 500??? kg to pull around it's not
going to be slow.
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procomp
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| posted on 30/11/07 at 02:09 PM |
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Hi well the min weight for locost is 615kg with driver onboard. But yes it dose move at a fair old pace.
The trouble is that you dont want to use the brakes and scrub the speed off. So most places are flat and they learn to drive smoothly.
Hi Tim C it's a big wooden spoon and there's plenty of life left in it yet . I will show you when you got yours running .
Cheers Matt
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John Bonnett
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| posted on 30/11/07 at 05:37 PM |
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quote: cool, thats sounds great, I'll get it down a rolling road sometime and find out for sure!
Don't take too much notice of the BHP figure from a rolling road. Two identical engines will give different figures if for example the cars are
running different diff ratios. You would get a higher reading in third gear as opposed to top. The only true figure is that obtained on a dyno.
John
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IndyJohn
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| posted on 30/11/07 at 05:58 PM |
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you can also put more air in the tyres for a better BHP reading
john
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Antnicuk
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| posted on 3/12/07 at 02:04 PM |
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i thought dynos had a correction facility to take into account tyre size and profile and diff ratio etc, the one i use enters all that info first
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
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MikeRJ
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| posted on 3/12/07 at 03:35 PM |
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quote:
Originally posted by Antnicuk
i thought dynos had a correction facility to take into account tyre size and profile and diff ratio etc, the one i use enters all that info first
It's still only a "best guess". On the coast down the rollers are effectively putting any loads through the transmission backwards,
and the torque being put through the transmission and tyres etc. will be very low compared to when the engine is powering the rollers.
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