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
phillpot said:
Glen is the expert on these but if pitting is not truly horrendous I'd have thought a repair is possible, build up with weld or braze and file down?
I'm only an expert on the longer RH one. 
The part no.73TF-9431-CA is correct, it is sourced from the Cortina/ Taunus 2.3 V6 Cologne LEFT hand side and is rarer than hen's teeth in piles of rocking horse poo.
TVR modified the manifold by grinding the flange faces to a taper like this to get clearance from the chassis rail....
I managed to grind mine using this method.......
[ See pic below, view looking down, problem with first illustration
]....with the angle grinder clamped in a vice, and carefully grinding down to the tapered marks I had made with a yellow paint pen.
Perhaps you could reface your eroded flange faces this way if they're not too bad. But be careful!
These cast manifolds are weldable by someone who knows what they are doing, by pre- heating & using special rods for cast iron.
Edited by glenrobbo on Tuesday 12th August 10:57
Continued....
The manifold from 2.8 Capri / Granada is longer and has a "fin" on top of the downward leg ( it looks a bit like a fish ). This will not fit unless the downpipe ( "hockey stick" ) is shortened & a new flared end is made to fit.
As for the LH manifold ( I'll see if I can see the part no. later ), it's possible that the Capri/ Granada RH one MAY fit. It looks to be the same size & shape as the 2.3 Cortina one, but with a joint face integral with the casting instead of a separate joint ring.
This manifold is not as scarce, should be available on fleabay, old Ford parts specialists, or through the banger racing fraternity.
I have one in my spares collection, I also have my original RH manifold if you're really desperate, but it has been welded in two places & comes with no guarantees.
That broken lug is now welded back on and new studs are fitted.
When you come to refit them, I recommend that you use these thicker composite gaskets with the metal flame ring, they are much better than the stamped All-metal type.
The manifold from 2.8 Capri / Granada is longer and has a "fin" on top of the downward leg ( it looks a bit like a fish ). This will not fit unless the downpipe ( "hockey stick" ) is shortened & a new flared end is made to fit.
As for the LH manifold ( I'll see if I can see the part no. later ), it's possible that the Capri/ Granada RH one MAY fit. It looks to be the same size & shape as the 2.3 Cortina one, but with a joint face integral with the casting instead of a separate joint ring.
This manifold is not as scarce, should be available on fleabay, old Ford parts specialists, or through the banger racing fraternity.
I have one in my spares collection, I also have my original RH manifold if you're really desperate, but it has been welded in two places & comes with no guarantees.
That broken lug is now welded back on and new studs are fitted.
When you come to refit them, I recommend that you use these thicker composite gaskets with the metal flame ring, they are much better than the stamped All-metal type.
Edited by glenrobbo on Wednesday 13th August 22:48
Ok Mikestvrs1,
I've checked the part no. on my LH manifold, and it pretty much tallies with the what I presume is a Granada item. See photo, the top ( longer ) one won't fit the S1 RH side but after a visual comparison I'm pretty sure the bottom one will fit the LH.
79TF 9430 EB. ( the original on my S1 is suffixed - E[]D )
These manifolds are from Phillpot's surplus stock, and in vgc.
If you can't repair yours or source a replacement, either would be available for the cost of postage ( it's heavy! ) and a suitable donation to Longers' chosen charity. Or could be picked up at SCH if anyone local to you is attending.
Hope all this is some help.
By the way, welcome to the best forum, don't be a lurker
Good luck with the rebuild & let's see some pics.
Oh, and get your details on the Owners List ( see top of the forum )
All the best
Glen
I've checked the part no. on my LH manifold, and it pretty much tallies with the what I presume is a Granada item. See photo, the top ( longer ) one won't fit the S1 RH side but after a visual comparison I'm pretty sure the bottom one will fit the LH.
79TF 9430 EB. ( the original on my S1 is suffixed - E[]D )
These manifolds are from Phillpot's surplus stock, and in vgc.
If you can't repair yours or source a replacement, either would be available for the cost of postage ( it's heavy! ) and a suitable donation to Longers' chosen charity. Or could be picked up at SCH if anyone local to you is attending.
Hope all this is some help.
By the way, welcome to the best forum, don't be a lurker
Good luck with the rebuild & let's see some pics.
Oh, and get your details on the Owners List ( see top of the forum )
All the best
Glen
Edited by glenrobbo on Saturday 16th August 08:29
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!
mikel003003 said:
hi could you tell me where those gasgets came from?
Hi Mikel,I got them from Speedyparts, but any good motor factor should be able to get them for you, or try Gaskets for Classics on the interweb.
Quote the Payen part no from my photo & tell them you want the thicker composite type with the metal flame ring.
Edited by glenrobbo on Saturday 16th August 08:23
mikestvrs1 said:
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
Be careful not to grind an edge away when you lower the manifold onto the grinder. And don't slice through your wrist either. I recommend sturdy gauntlets, a mask & goggles. Make sure the grinder is securely clamped as well.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
A linisher would be good if it's abrasive enough. There is a lot of cast iron to remove.
mikestvrs1 said:
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've only just noticed this query, thanks to Mikel's repost.Does an entry need to be added by editing the source file?
I have absolutely no idea, BarryS1 did mine, I don't do computers.
You have to cut it out & glue & drop a left click or something
Best get somebody a lot younger than me to show you.
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.
Well Mike,
Looking at your photos, I would say your LH manifold is quite ok to use, it's cleaned up well.
And your RH one should also give a gas tight seal using the gaskets I recommended.
So if I were you, I would go ahead and use them.
If you do have a problem, let me know & I'll post you either or both of them, but my spare RH one is not a great deal better than yours, it's been welded in two places, one was a crack extending to the port.
See how you get on first.
Looking at your photos, I would say your LH manifold is quite ok to use, it's cleaned up well.
And your RH one should also give a gas tight seal using the gaskets I recommended.
So if I were you, I would go ahead and use them.
If you do have a problem, let me know & I'll post you either or both of them, but my spare RH one is not a great deal better than yours, it's been welded in two places, one was a crack extending to the port.
See how you get on first.
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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