Alpine R8 GT Turbo Too?

[BobG]

If you take the plug leads off one at a time you should be able to find out which cylinder. Has it lost a stemseal or two?? have you checked the valve clearances??

I pulled the plug leads one at a time (a shocking experience). Cylinder #2 is defintely the source of the ticking. I put different plug in cyl 2 and still got ticking. I retested the compression in #2 and it was 160 psi just like the other three. I checked the valve clearance and it was 0.01in on the exhaust valve instead of 0.008in spec value. I re-adjusted it and the motor is still ticking.

To recap, the motor was running fine with no ticking or smoking before I removed the carb to re-jet and increase the AFR under boost. The ONLY thing I removed and replaced was the carb. So the most likely cause of the ticking would be that something fell into the intake manifold and got sucked in to #2 cylinder. But, it didn't affect compression.

I'm ready to remove the cylinder head unless one of you has better suggestion.

Or it’s a leak on the manifold somewhere? They have a habit of ticking??

But don’t forget, you’re dealing with early 19th century technology here, so don’t expect it to run like a Lexus. Get in and get some miles on the old girl!

Yes she's an old girl but I don't want her to have a stroke!

 

[Adey]

get a video of the ticking? if it was something in there the ticking would be there with it firing or not. carb base gasket? manifold gasket? put a bore scope in before whipping the head off

 

[BobG]

get a video of the ticking? if it was something in there the ticking would be there with it firing or not. carb base gasket? manifold gasket? put a bore scope in before whipping the head ofI'll post a video.

I'll post a video tomorrow.

Good point about ticking every stroke vs only when firing. I didn't have the manifold off so I don't think that's involved. I don't understand how a carb base gasket could affect a single cylinder.

Here's a photo of the spark plugs. #2 is second from the right. It looks colder than the other but no oil on it.


I've thought about a borescope. It's probably worth the money to avoid removing and refitting the head.

 

[Adey]

Just running through the bits that could tick... Manifold gaskets do blow though, could be a coincidence, it may have been on its way and now you are listening for it

Amazon phone/bore scope may be ok for this.

 

[Steve Swan]

Could be a bit of piston slap. Tends to disappear when not firing. May have to whip the head off for a look see. Bloody Irritating to say the least

 

[BobG]

Here's a link to a video of the ticking and smoking:

I should have the head off tomorrow.

 

[Steve Swan]

Sounds more like a blow on the manifold. Is the turbo sending oil up the inlet??
Thinking about it taking the plug lead off would kill the noise on a blowing manifold as there's no bang.

 

[BobG]

Pardon my ignorance Steve, but what's a blowing manifold?

 

[Big Steve - Raider]

Pardon my ignorance Steve, but what's a blowing manifold?

Manifold gasket leaking

 

[Steve Swan]

That's what I thought I typed cheers @Big Steve - Raider

 

[Adey]

id not be rushing to pull the head yet tbh. tubular manifold with a blowing gasket and a turbo on its way out could cause them issues there

 

[Brigsy]

That sounds like manifold gasket leak or cracked manifold

 

[BobG]

Going out to pull the manifolds ...

 

[BobG]

Damn you guys are good! The manifold gasket was blown below cyl #2 exhaust port. The cause was my warped exhaust manifold flange.





I'll get the flange ground flat and a new gasket and I'm back in business. That's a big relief after expecting the worst.

TurboRenault does it again!

 

[Steve Swan]

Don't clap, Just throw Money.........

 

[Big Steve - Raider]

Damn you guys are good!

We aim to please…

 

[BobG]

Don't clap, Just throw Money.........

I have a thing in my garage where I throw all my money.

 

[Steve Swan]

Actually, while we're at it is there any trace of oil in the inlet ports at all ?? You've got the tick, but what about the smoke .....

 

[Steve Swan]

I have a thing in my garage where I throw all my money.

I've got some of them too. In fact everybody here has, to a greater or lesser extent.

 

[Brigsy]

The full fibre gaskets are not the best. Try an find oem c1j with half steel half fibre