inlet manifold

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inlet manifold

Postby johnj » Thu 13.01.2022, 20:41

Hi

I was finally going to be getting the car back :D after new cylinder head gasket, timing belt, etc work. The mechanic had had the car out a couple of times, everything ok. He took it out for a last shake down, by which I think he meant it was enthusiastically driven. He said it was running really well. When the turbo cut in the inlet manifold gasket blew. He blamed inferior gaskets. Are some manifold gaskets better than others? Where would be the best place to buy them?
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Re: inlet manifold

Postby HJ2 » Mon 17.01.2022, 09:18

I never heard of a blown inlet manifold gasket, especially after a head rebuild, since the gasket should be new.
This is no known problem, at least not to me. What gasket failed exactly?
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Re: inlet manifold

Postby Tuga2112 » Mon 17.01.2022, 10:50

"inlet manifold gasket blew"


is this the intake plenun gasket he refers to?
that would cause a air leak on the intake and reduced boost under load and possibly (depending on the size of the leak) a higher than usual iddle RPM
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Re: inlet manifold

Postby HJ2 » Mon 17.01.2022, 11:00

I don't know but don't want to speculate just yet :-)
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Re: inlet manifold

Postby dapinky » Mon 17.01.2022, 12:12

I'm completely with my Dutch friend on this one!

As Henk-Jan says, I have never come across a blown inlet manifold gasket.

I can only assume that something wasn't done up properly on the intake manifold, or a serious blockage has led to very high air pressures......

...... even under 'full turbo boost' there will only be 1.9 bar of pressure in the manifold (okay, it could overboost, but I'm going with 'standardish' numbers.) A sudden lift-off of the throttle could give a very temporary increase, but I've never known the gasket to fail.

That said - I suppose this could just be the first documented failure of a poor part - but it certainly isn't a common problem.
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Re: inlet manifold

Postby Simon_P » Mon 17.01.2022, 15:44

dapinky wrote:I'm completely with my Dutch friend on this one!

As Henk-Jan says, I have never come across a blown inlet manifold gasket.


It would be difficult to "blow" an inlet gasket even if it was old cornflake packet ... Leaking maybe?
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Re: inlet manifold

Postby johnj » Mon 17.01.2022, 18:14

On the SJ sportscar site they call the gasket that failed the injection housing to head gasket, PNM call it the inlet manifold gasket. My mechanic showed me the gasket and the bottom of the gasket on the 1st/ 4th hole was missing. It had passed its MOT just before the last run and all the exhaust gassed where well within spec. If the gasket had been wrongly fitted would that have put the exhaust gasses outside MOT specs?
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Re: inlet manifold

Postby HJ2 » Tue 18.01.2022, 10:17

That area is full of sharp 90 deg. angles. However, you must really try hard to ruin the (paper) seal during assembly.
Still I am in disbelief that someone placed a defective seal here, but it looks like the job was coc**ed-up
(perhaps the head placed first and then the manifold bolted on, accompanied by a lot of swearing...)
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Re: inlet manifold

Postby Rambo » Tue 18.01.2022, 14:57

johnj wrote:On the SJ sportscar site they call the gasket that failed the injection housing to head gasket


This one? https://www.sjsportscars.com/parts-and- ... E6100S.htm
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Re: inlet manifold

Postby Simon_P » Tue 18.01.2022, 17:43

HJ2 wrote:(paper) seal during assembly.
You do it an injustice HJ it is impregnated cardboard. It would be easy to break on disassembly and probably got reused - nothing serious. I've reused them before.

johnj wrote: If the gasket had been wrongly fitted would that have put the exhaust gasses outside MOT specs?
No, it would be evident as a vacuum leak and tune out with the idle screw /iac valve. Assuming it wasn't too big.
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Re: inlet manifold

Postby johnj » Tue 18.01.2022, 19:58

Yes Rambo it was that one.

You could have a point HJ2 he said it was a 'very naughty word' of a job putting that gasket on and was extremely upset :twisted: :twisted: :twisted: at the thought of having to go through that again. I assume that as the head is in place there is no easy way of fitting the gasket?
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Re: inlet manifold

Postby Rambo » Tue 18.01.2022, 20:49

I suspect your mechanic may well have screwed up
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