Low power output!

[105epwr]

After i put my bike carb conversion on and had it on the rollers it made 165bhp which is shit after sum investigation and back to the ol drawing board i thought ill do a compression test -basically i found the problem i compared them to my valver which had 180psi on each cylinder the williams made 110psi on 3cyl and 90psi on the other!so ive now got a nice project!so hopefuly after a rebuild i should see a power increase!!!

[stevie_b]

Glad you have an avenue to pursue. Sure you can get some decent power out of carbs once you have it all sorted :lol:

[midge]

nice one mate, get it fixed, i wanna see what it realy makes!

[MAXIBOY]

After i put my bike carb conversion on and had it on the rollers it made 165bhp which is s**t after sum investigation and back to the ol drawing board i thought ill do a compression test -basically i found the problem i compared them to my valver which had 180psi on each cylinder the williams made 110psi on 3cyl and 90psi on the other!so ive now got a nice project!so hopefuly after a rebuild i should see a power increase!!!

are you sure this isn't due to some inlet restriction due to the carbs before stripping...try a cylinder leakage test too...

[matty w]

it seems a bit strange that there consistantly low maybe like maxiboy says its to do with the carbs

[105epwr]

I think i might do a cylinder leakage check aswell yes BUT the car also unlike my valver it has a slight mist coming through the breather pipe as ive got the cam cover breather pipes going through them little filters my valvers done 104k and that dont breath atall-so i think its worn,valves not seating or broken piston rings-i have a ford anglia with a stage 3 1700 x-flow i cracked the piston rings on that and it did the same things!
i want to take the head of it anyway so i can port it and skin it 40tho to up the c/r slightly.
cheers for the replys

[stan]

as per the pm, you need to do it with the throttles open.
The std engine will show higher cranking figures as it has a plenum full of air to compress, whilst the carbed engine has little air behind the throttles!

they all tend to breath a bit.

[105epwr]

i put on a full s/s exhaust as before i had the side exit-must admit didnt notice ANY difference in performance apart from it so nice and quite now.
i also plugged back in the loom the only thing unplugged are the injectors as i thought the ecu may of gone in to default or limp home mode,i put the snap on scanner to see what codes i have and it only comes up as "injectors open circuit" but still no real performance gained!!?? :cry:

[midge]

where do you plug the scanner in? a bit of topice, sorry.

[105epwr]

where do you plug the scanner in? a bit of topice, sorry.
Drop the fuse box down in passenger side under glove box theres a square type 6pin plug-but you need the renault plug with an OBD lead.