Rough valver

Ive just fitted a kr 16v into my mk2 8v and it starts it will tickover fine but wont rev past 4ooorpm [:^(] its very lumpy when revving up and seems to be holding back,any ideas as i want it on the road to start terrorising paxos and the like
Its standard apart from 8v zorst and K&N in modded box
Edited by: flusted

 

Have you got all the 16v fuel setup??

Could be dodgy leads, hall sender.

 

Had a similar problem with mine once, it was the hall sendor in the dizzy - maybe try that. Also, could be leads as said above. Sounds like an electrical or fuel starvation problem to me.

Good luck!

 

Yep,i changed the meterhead but didnt change fuel pump,is that a prob? Also wots the hall sender

 

If it was digi and you fitted k-jet then you`ll need the k-jet pump for the correct fuel pressure

 

nope,it was k-jet anyway any other ideas?

 

Don`t know if the 8v and 16v pumps are the same, could still be your fault?

You need to find out what pressure 8v and 16v pumps produce.

I think the ecu etc is different as well going by the haynes but couldn`t be sure, did you fit all the 16v stuff (warm up reg etc?)

 

Check valve timing as well...

 

Cam timing Have you fitted a cam belt?

It's easy to time it up, then tension the belt and it pulls the crank round putting the cam timing out.

Dex's 16v was flat as a phart after 4k when he got it, I drove it and said it was the cam belt out, and sure enough it was 2 teeth out.

 

If the cam belt was as much as one tooth out on the KR, would it be immediately obvious?

 

Obvious to who?

As I've said, it's easy to get the timing right with the belt off, fit the belt and tension it.. as you do so, the crank is pulled round, putting the timing out.

Should turn the crank back a tooth, then tension the belt, this puts the timing right.

If you check it after turning the engine over by hand a complete revolution and it's ok, no probs.

Some people just time it up, tension it, say b0ll0x to it and fit the covers

 

To clarify, what I mean is - if the timing belt is even just a tooth out, then does this have a significant effect on performance?

 

I must have re-checked mine a hundred times to make sure it was spot on!

 

Trev, yes it does

 

Ah. That means mine must be spot on then. Heh.

 

I havent touched anything like the cambelt but the engine was runnin sweet when i took it out of donor car.iChanged the hole engine wiring loom and ecu and meterhead and i know the fuel pumps are the same

 

When you say it will not rev past 4k is that on the drive or on the road..

As GVK cam timing is a prime suspect,

I assume you have done the timing of the flywheel ?? and the ECU is advancing correctly

Cam and ignition timing can be quickly checked by using the MFA , reset it once warm and on a run if it hovers around 20mpg then timing is out if its about 30-35mpg then its lack of fuel .. under load


Edited by: dUff