S1 2.8 Exhaust manifolds
Discussion
Hi Guys,
I am new to this forum lark so please bear with me.
I am in the middle of a complete body off chassis rebuild and have taken the opportunity to "remove" (loose term) the leaky exhaust manifolds to replace gaskets etc. The etc. being having to cut away the nuts, drill out studs and re-tap the head(s) and fit new studs.
Surprisingly the manifolds survived the abuse that they were inflicted to during removal.
The longer manifold (Right side) has a part number 73TF-9431-CA clearly marked and is Ok apart from part of one stud flange missing (has been like that for the last couple of years).
The shorter manifold (left side) has badly corroded mating faces (to the head) and the part number is unreadable.
I notice that there have been several past discussions about the exhaust manifolds on the 2.8 cologne used in the S1. Did any of these come to definitive part numbers for these two manifolds ?
And does anyone know of a source for these ?
If not I can re-use the longer one and will have to try to get the faces machine flat and true on the shorter one.
MikesTVRS1
I am new to this forum lark so please bear with me.
I am in the middle of a complete body off chassis rebuild and have taken the opportunity to "remove" (loose term) the leaky exhaust manifolds to replace gaskets etc. The etc. being having to cut away the nuts, drill out studs and re-tap the head(s) and fit new studs.
Surprisingly the manifolds survived the abuse that they were inflicted to during removal.
The longer manifold (Right side) has a part number 73TF-9431-CA clearly marked and is Ok apart from part of one stud flange missing (has been like that for the last couple of years).
The shorter manifold (left side) has badly corroded mating faces (to the head) and the part number is unreadable.
I notice that there have been several past discussions about the exhaust manifolds on the 2.8 cologne used in the S1. Did any of these come to definitive part numbers for these two manifolds ?
And does anyone know of a source for these ?
If not I can re-use the longer one and will have to try to get the faces machine flat and true on the shorter one.
MikesTVRS1
Thanks for all the info and photos Glen.
I checked the RH manifold and originally did not notice the angled mounting flanges. That must have caught a few unfortunates out when replacing.
I will try to get my Rh manifold repaired but it is only part of the hole that is missing and it seems to have been holding OK for years so I may be able to get away with it as is.
I had another look at the LH manifold and with the correct lighting and a bit of "brass rubbing" technique I managed to decipher the part number and it comes out as 79 TF 9430E[]C (the C could be a D and the [] looks like a square blob). It also has the built in downpipe flange mounting ring rather than the separate "olive" style used on the RH manifold.
This looks like your LH manifolds.
I will try to re-surface the flanges on the LH manifold.
I will have to borrow a mates 9" grinder to try your method or possibly get access to a linisher.
I will let you know how I get on and if it falls to pieces on me then I would be pleased to take you up on your offer.
Also
Ref the owners list (I assume that this is item 1 on the S forum list).
Does an entry need to be added by editing the source file?
I checked the RH manifold and originally did not notice the angled mounting flanges. That must have caught a few unfortunates out when replacing.
I will try to get my Rh manifold repaired but it is only part of the hole that is missing and it seems to have been holding OK for years so I may be able to get away with it as is.
I had another look at the LH manifold and with the correct lighting and a bit of "brass rubbing" technique I managed to decipher the part number and it comes out as 79 TF 9430E[]C (the C could be a D and the [] looks like a square blob). It also has the built in downpipe flange mounting ring rather than the separate "olive" style used on the RH manifold.
This looks like your LH manifolds.
I will try to re-surface the flanges on the LH manifold.
I will have to borrow a mates 9" grinder to try your method or possibly get access to a linisher.
I will let you know how I get on and if it falls to pieces on me then I would be pleased to take you up on your offer.
Also
Ref the owners list (I assume that this is item 1 on the S forum list).
Does an entry need to be added by editing the source file?
Hi Barry S1,
Assuming that I have won the lottery, but not with enough cash to migrate to a chim or grif, does anyone supply fabricated SS manifolds to match the cast iron originals?
The last time a looked I was offered new SS manifolds but these had revised downpipe fitting so also needed new SS downpipes to match.
I have already replaced my old worn out mild steel downpipes with SS so really do not want to replace them again.
Mike
Assuming that I have won the lottery, but not with enough cash to migrate to a chim or grif, does anyone supply fabricated SS manifolds to match the cast iron originals?
The last time a looked I was offered new SS manifolds but these had revised downpipe fitting so also needed new SS downpipes to match.
I have already replaced my old worn out mild steel downpipes with SS so really do not want to replace them again.
Mike
Reference lottery win and Chim/Griff comment.
I bought my S as a project.
I travelled to the le Mans 24 hour each year as part of a group (Team Citrus), as a passenger/co-driver in my son's Lotus Elise.
In 2011 I foolishly suggested that I could buy an unloved project car, put it together, and take it on the next Le Mans trip.
He found the S in a work colleague's garage where it had rested,unstarted and unmoved for 10 years or so.
The rebuild took longer than expected and I was a Lotus passenger again in 2012 but the S has taken me to Le Mans for the last two years (2013 and 2014) and apart from a squealy fan belt in 2013 it has not missed a beat.
I decided that after the resurrection it deserved to be given the full treatment and hence the chassis rebuild and all the tiresome questions.
You don't really think I would ditch it in favour of a chim or griff ?
By the way I don't do the lottery and haven't won anything in years!
I bought my S as a project.
I travelled to the le Mans 24 hour each year as part of a group (Team Citrus), as a passenger/co-driver in my son's Lotus Elise.
In 2011 I foolishly suggested that I could buy an unloved project car, put it together, and take it on the next Le Mans trip.
He found the S in a work colleague's garage where it had rested,unstarted and unmoved for 10 years or so.
The rebuild took longer than expected and I was a Lotus passenger again in 2012 but the S has taken me to Le Mans for the last two years (2013 and 2014) and apart from a squealy fan belt in 2013 it has not missed a beat.
I decided that after the resurrection it deserved to be given the full treatment and hence the chassis rebuild and all the tiresome questions.
You don't really think I would ditch it in favour of a chim or griff ?
By the way I don't do the lottery and haven't won anything in years!
I have just spent an hour on a decent sized linisher and the left hand manifold (shorter) has come up pretty good.
I then did the same with the right hand manifold and although surfaced reasonably well the nice shiny surface exposed a couple of cracks in the flanges that I had not noticed before.
So the LH manifold looks like it will do the job but the RH manifold has a crack in the previously intact hole and another crack starting in the hole that is not a hole if you get my drift.
See pictures below (I hope).
![](http://thumbsnap.com/sc/3ZHvRFkp.jpg[/img]</a> <a href="http://thumbsnap.com/kdLpet2s" Target="_blank">[img]http://thumbsnap.com/t/kdLpet2s.jpg)
Glen if you still have an intact RH manifold (and LH if available)I would happily pay for postage and make a suitable donation to a cause of your choice.
I then did the same with the right hand manifold and although surfaced reasonably well the nice shiny surface exposed a couple of cracks in the flanges that I had not noticed before.
So the LH manifold looks like it will do the job but the RH manifold has a crack in the previously intact hole and another crack starting in the hole that is not a hole if you get my drift.
See pictures below (I hope).
Glen if you still have an intact RH manifold (and LH if available)I would happily pay for postage and make a suitable donation to a cause of your choice.
Thanks Glen,
I will see if my local welders can do anything with the crack and flange.
They are certified for aircraft welding work and did a fine job on my golf trolley a few years back.
I will let you know how it goes.
If the RH one breaks up when I am fitting it I may well need a back up solution.
I will see if my local welders can do anything with the crack and flange.
They are certified for aircraft welding work and did a fine job on my golf trolley a few years back.
I will let you know how it goes.
If the RH one breaks up when I am fitting it I may well need a back up solution.
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