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Old 1 Week Ago   #16
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Re: Low compression on all cylinders

Quote Originally Posted by portland_bill View Post
Without the catalytic converter, MOTs might be a problem.
My car doesn't have a cat. It's a 1991 mk2. The question I suppose is whether the "new" 1.2 engine uses the same exhaust manifold bolt pattern as the older FIRE engines?

I realise I neglected the link and the price.
https://www.ebay.co.uk/itm/STAINLESS...3/120540980357
It's 105 delivered which is a big part of the appeal
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Last edited by nitro_warrior; 1 Week Ago at 22:58.
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Old 1 Week Ago   #17
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Re: Low compression on all cylinders

It is a long time since I had to remove the head from one of these.
It appears that the manifold gasket is actually four separate gaskets, one for each cylinder, just an oval gasket, a round hole in the middle for the exhaust, and two bolt holes.

Payen, oneof the oldest gasket brands list the same part nmber for 1.0, 1.1 and 1.2 FIRE engines, so at least the port and bolt holes should be ok.

BUT!
As these are separate gaskets, spacing apart might change.
The 1.2 engine is taller, to allow the longer stroke, so the exhaust downpipe is longer for the exhaust to pass under the sump. Fitting this manifold to a 1.0 or 1.1 is likely to put the exhaust lower to the ground, giving initially clearance issues, but will also destroy the rubber mountings quickly.
The exhaust is designed to sit horizontally along under the car, hanging gently on its rubber mountings. If the downpipe is longer, the rest of the exhaust will slope gently upwards towards the rear. The first mountings (centre), will take all the weight, as the rear mountings will do nothing except inhibit sideways movement. The centre mountings will give up under the strain fairly quickly, requiring regular replacement. The rear of the exhaust is also likely to hit the underside of the car.

I had this problem many years ago, with a Fiat Argenta. An aftermarket exhaust had a downpipe 5mm too long. The cente mountings lasted around a fortnight each until the pipe was replaced.
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Old 1 Week Ago   #18
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Re: Low compression on all cylinders

Quote Originally Posted by portland_bill View Post
It is a long time since I had to remove the head from one of these.
It appears that the manifold gasket is actually four separate gaskets, one for each cylinder, just an oval gasket, a round hole in the middle for the exhaust, and two bolt holes.

Payen, oneof the oldest gasket brands list the same part nmber for 1.0, 1.1 and 1.2 FIRE engines, so at least the port and bolt holes should be ok.

BUT!
As these are separate gaskets, spacing apart might change.
The 1.2 engine is taller, to allow the longer stroke, so the exhaust downpipe is longer for the exhaust to pass under the sump. Fitting this manifold to a 1.0 or 1.1 is likely to put the exhaust lower to the ground, giving initially clearance issues, but will also destroy the rubber mountings quickly.
The exhaust is designed to sit horizontally along under the car, hanging gently on its rubber mountings. If the downpipe is longer, the rest of the exhaust will slope gently upwards towards the rear. The first mountings (centre), will take all the weight, as the rear mountings will do nothing except inhibit sideways movement. The centre mountings will give up under the strain fairly quickly, requiring regular replacement. The rear of the exhaust is also likely to hit the underside of the car.

I had this problem many years ago, with a Fiat Argenta. An aftermarket exhaust had a downpipe 5mm too long. The cente mountings lasted around a fortnight each until the pipe was replaced.
Thanks. Yes, I suspect it would be too long. It is also quite a different to the stock exhaust manifold which doesn't have a long "tail" and rather bolts to the exhaust near the top of the engine. If I were to go for it I would be cutting the downpipe shorter and fabricating a new coupling to the rest of the exhaust.
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Old 11 Hours Ago   #19
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Re: Low compression on all cylinders

Decided to go for it and order the stainless manifold. I have actually welded the tab back on the old manifold and will use that for now. However, the stainless one fits the stud pattern and looks good. 2" diameter rather than the stock 1-1/2". I will check how low to the ground it is. Ultimately I will probably take it to get a custom stainless system put on using this as a starting point.

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Old 4 Hours Ago   #20
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Re: Low compression on all cylinders

Looks mean! like some sort of cyborg fist from a Marvel movie
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