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Exhaust Woes


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#1 Major Burkenshaw

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Posted 15 May 2007 - 05:51 PM

I am currently in the process of converting my 1000cc auto clubby estate to an spi engine. Everything was going ok until I got to the exhaust system. The original exhaust manifold I fitted was a cheapy ebay one(but a new part) and when fitted there was approx. 4mm of clearance between the center branch and the inner CV joint. I was concerned about this, so decided to order another exhaust manifold from mini spares, which looked like a decent part. But after fitting the new exhaust manifold, the clearance is even less :(

Below is a pic of the gap(4mm) with the old ebay manifold

Posted Image

Has anyone got any ideas? I'm at my wits end with it now ;)

#2 Bungle

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Posted 15 May 2007 - 05:53 PM

are you buying spi manifolds ?

#3 Major Burkenshaw

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Posted 15 May 2007 - 06:05 PM

are you buying spi manifolds ?


How do I say "I'm not stupid" without causing offence :(

#4 Bungle

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Posted 15 May 2007 - 06:37 PM

some people are

#5 biggav

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Posted 15 May 2007 - 06:41 PM

so are you keeping it auto????

The auto subframe moves the engine forward a bit... i think they use it on turbos to give extra clearance which would mean that the manifold is also a fraction further foreward than it should be.... was the auto manifold different and could you put a lamda sensor tap on to it?

#6 Bungle

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Posted 15 May 2007 - 06:49 PM

are you leaving it a 998 engine ?

as a 1275 block is taller

#7 Major Burkenshaw

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Posted 15 May 2007 - 07:36 PM

so are you keeping it auto????

The auto subframe moves the engine forward a bit... i think they use it on turbos to give extra clearance which would mean that the manifold is also a fraction further foreward than it should be.... was the auto manifold different and could you put a lamda sensor tap on to it?



are you leaving it a 998 engine ?

as a 1275 block is taller



Surely the manifold is bolted to the engine along with the drivetrain. So if the engine mounts were in a different place it wouldn't change the relative postion of the exhaust manifold to the CV joint?

No I'm not keeping it auto. I swapped over the entire front subframe/engine assembly from a manual 1275 Spi

#8 biggav

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Posted 15 May 2007 - 08:44 PM

got me stumped.... if its a spi engine, gearbox, subframe and manifold... then it should all fit......we wait patiently for the all knowing mini docs......

#9 Bungle

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Posted 15 May 2007 - 09:05 PM

dan.............

#10 Sprocket

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Posted 15 May 2007 - 10:57 PM

Are you sure the manifold flanges are square and flush to the head,if they are then its down to the quality of the manifold and nothing else.

One thing i do notice, whether it has any bearing on this, is the joint boot used on the inner joint is he wrong one.

to be honest Maniflow are the only manifolds to use for this reason.

Some things to consider. The later 1275 subframes have the engine sitting 12mm forward of what would be the norm. The engine tie bar on both these later 1275 cars and all autos is 12mm longer. Later 1275 gear selector rods are 12mm longer.

So, say for instance, you fit the engine in its normal position but use an auto or late 1275 engine tie bar, the engine will be tilted forward, the maniflod outlets will be in the wrong orientation, if trying to compensate for this, there may be the issue you have.

Check that you are using all the SPi or late 1275 parts or all the original pre 90 non auto parts for fitting the engine correctly.

The SPi inlet manifold will fit with the engine in which ever location, the engine was only ever moved forward for the HIF carbs.

Oh and the other thing is Non injection exhaust manifolds foul the bottom coolant pipe of the injection inlet manifold.

#11 Major Burkenshaw

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Posted 16 May 2007 - 05:15 PM

Are you sure the manifold flanges are square and flush to the head,if they are then its down to the quality of the manifold and nothing else.


That was the first thing I checked. My first thought was a poor quality manifold, hence the reason I brought another one. This is the second manifold:

Clicky

Some things to consider. The later 1275 subframes have the engine sitting 12mm forward of what would be the norm. The engine tie bar on both these later 1275 cars and all autos is 12mm longer. Later 1275 gear selector rods are 12mm longer.

So, say for instance, you fit the engine in its normal position but use an auto or late 1275 engine tie bar, the engine will be tilted forward, the maniflod outlets will be in the wrong orientation, if trying to compensate for this, there may be the issue you have.


I also considered this. I used the tie bars form the later injection car. But I came to the conclusion that even if the tie bar was longer, it still wouldn't affect the distance from the exhaust to the cv joint as they would remain in the same relative postion to each other. It would mearly tilt the exhaust at the Y section upwards towards the floor of the car.


Oh and the other thing is Non injection exhaust manifolds foul the bottom coolant pipe of the injection inlet manifold.


Nope no fouling. It really getting on my moobies now ;) :(

#12 Major Burkenshaw

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Posted 16 May 2007 - 05:18 PM

I did have one thought though. Are the driveshafts sided? The metal part of the joint seem slightly longer on the other side of the diff housing, but it might just be me??? I've had nothing else to indicate that they are the wrong way round.




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