Hi All, Long story short, I bought a 914 with two turbos strapped to the back and a Holley EFI installed. It never ran well so I decided ditch the turbos and try carbs. Prior to installing the carbs, I took a shot at adjusting the valves as I thought that might be contributing the car running rough.

Now with the carbs installed, it seems the valves in cylinder 2 are off. Lots of knocking and exhaust coming out of the cylinder 2 carbs.

Is this a valve adjustment issue? Or something else like timing?

Much appreciate the help.


https://www.youtube.com/watch?v=tzSmoiLO8mc

Compression test.

Leak down if trouble seen in comp test.

Possibly correct valve adjustment???

recheck comp/leak down tests

You have what looks like intake valve not seating correctly on cyl #2 to me.

My money is on wounded engine, but you might get lucky...



I'd LOVE to see the twin turbo set up on that.

It would need tiny little turbos.

4 head bolt air cooled design is less than ideal with boost, but a mild system done perfectly might do OK.
Two baby turbos would be interesting...

I would love to see it too, but a dropped seat in cylinder 3 might be what you are looking at.

Hate to say, but she doesn't sound good. Keep us updated with your progress.

You traded Holly EFI for carbs?

Lazy man's way.

Leak down. It will tell you what your next steps are.

I'd like to see more of the turbo setup. Looking for more waays to keep my car off the road and on the lift.

A quick snoop with an boro/endoscope after the compression test if you have one might be good. Actually if it were me, I would do that first.

Thanks, all. I will run some tests next weekend before dropping the engine. I had the engine out last winter and replaced just about every gasket/seal I could. I'm definitely a novice and didn't pay much attention to the valves and the cylinder heads.

Here is the bring a trailer link to the car I bought. 3rd owner in 3 years...should have figured it was problematic.

914TT

Welcome to 914world ra great place for you to get answers as we have so many guys super knowledgeable on these cars. There's going to be a debate about you having a turbo versus you having carbs or different kind of fuel injection, but I personally would have stayed with the turbos and the holly and got that to work. In the test video on BAT you never really see the guy jamming on it. Did it ever run strong?

Best of luck Bob B

Check your spark plug wire routing. Black wires are a little hard to see in the video but I think you have cyl 1 / 2 side messed up.

Firing order is 1-4-3-2 and rotor rotates clockwise