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TR4/4A TR3/TR4 Weber DCOE serious fitment issues

richie

Senior Member
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Hi everyone,

I was excited a little while ago when I found and purchased a twin Weber DCOE 40 kit to replace my tired leaky Strombergs. The kit was purchased directly from Pierce Manifolds who took over design of TWM manifolds, and who is a massively large Weber distributor / tuner extraordinaire.

I got my car out of storage to find that the inlet manifolds were significantly interfering with the stock cast iron manifold. I first thought it was my header wrap, so I removed the wrapping, only to find it still wouldn't fit by a long shot due to clearance issues on the inside two cylinders. Here are a few examples of fitment issues with the inner runners:

fit - misalignment with cyl 2.jpgfit - misalignment with cyl 3.jpg

So, my thinking is, I got Webers, maybe I need to buy a header as a sort of "price of admission". Turns out, very few people seem to be able to assure me their headers will be compatible with the oversized TWM inlet manifolds. I've tried BP Northwest, Rimmer Bros, TSI etc... And whats more surprising is that the manifolds don't even have enough clearance for the factory clamps which clamp on both the inlet/exhaust manifolds, the solution is to use hex/allen bolts with large washers which in my opinion wouldn't feel adequate:

fit - stud clearance front.jpgfit - stud clearance rear.jpg

I have only found one thread so far which indicated that the only inlet manifolds known to be compatible with the stock exhaust manifold is the CANNON manifolds. Fellow user Darrell_Walker posted a thread about his findings and seems to conclude that the TWM kit, as sold by Moss/Pierce, MAY fit with the Moss header.

At this point I am sharing this to share my experience with others, and hopefully, to find someone out there who might have some advice on how to successfully get these modern 'TWM' manifolds fitted on a TR3/TR4. I'm really having a hard time shelling another $500 for a header which will still have clearance issues with the Cyl #1 tubing.

Any wisdom or experience would be welcome, if not, maybe this thread will be a warning of the "fitment" of the TWM kits...
 
Last edited:

TR3driver

Great Pumpkin - R.I.P
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I've no experience, but ISTR others saying they got them to fit with judicious grinding of all components involved (both manifolds and the clamps).
 

PeterK

Yoda
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What advice did Pierce have? Did you ask them since they sold you the manifolds? I'd always start there first.
 

M_Pied_Lourd

Darth Vader
Country flag
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Not any help sorry, but just wanted to confirm as mentioned that the Cannon manifolds work with the Moss SS header. I did have to add a little weld to build up the contact area on the header where the football clamps held it but that's all the mods that were required.

Just a quick video of them installed...

https://youtu.be/_7QUGJqyCKw

Cheers
Tush
 
OP
richie

richie

Senior Member
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What advice did Pierce have? Did you ask them since they sold you the manifolds? I'd always start there first.

Pierce has been as helpful as they can be, their tech shop was telling me that they don't really sell very often to customers, more to shops/distributors like Moss etc, so they haven't had much first hand knowledge/experience of fitment issues. I've gotten the majority of my answers from Moss but we still can't seem to come to any solid conclusions.

At this point the more I think about it, there's no real solution besides buying another header and dealing with whatever final fitment issues there are with the header. I might need to seek reimbursement and go with Cannon's or go with another carb option.
 
OP
richie

richie

Senior Member
Offline
Not any help sorry, but just wanted to confirm as mentioned that the Cannon manifolds work with the Moss SS header. I did have to add a little weld to build up the contact area on the header where the football clamps held it but that's all the mods that were required.

Just a quick video of them installed...

https://youtu.be/_7QUGJqyCKw

Cheers
Tush

I've watched your videos a few times actually! Did you every try fitting them with the stock manifolds by any chance?
 

M_Pied_Lourd

Darth Vader
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Hi Richie,

No, I never did try with the stock exhaust manifold...sorry.

Cheers
Tush
 
OP
richie

richie

Senior Member
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Hey all, just wanted to log it for the history books. I ended up returning the kit as it looks like the only way this will work is if I order a header from Moss (they are not producing any at the moment due to their own fitment issues), or something else (TSI has a 4 week lead time and no confirmed fitment, BP Northwest has no confirmation of fitment either). Other option was to go with the Cannon linkage/manifold kit but that's just getting way too pricey. So unfortunately, no Webers for me in the near future. Contemplating SU's or Mikunis. Thanks to everyone for your insight.
 
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