Tubular manifold for 2.25 petrol?

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kevanf1

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Cheslyn Hay , Staffordshire
Hi everybody.

Can anybody tell me if it is still possible to purchase a tubular exhaust manifold in stainless steel for a series 2a 2.25 petrol engine please? I need to replace the exhaust and thought I may as well go the whole 9 yds sort of thing and fit a tubular manifold. You never know I might just get an extra 1mph out of it :) Trouble is I can't seem to find any for sale. MM 4x4 have a big advert for them but no link and no price :(

Take care all.

Kevan
 
kevanf1 said:
Hi everybody.

Can anybody tell me if it is still possible to purchase a tubular exhaust manifold in stainless steel for a series 2a 2.25 petrol engine please? I need to replace the exhaust and thought I may as well go the whole 9 yds sort of thing and fit a tubular manifold. You never know I might just get an extra 1mph out of it :) Trouble is I can't seem to find any for sale. MM 4x4 have a big advert for them but no link and no price :(

Take care all.

Kevan
Click to expand...

You could try phoning MM - they really are quite friendly! They're near Droitwich so they are within a drivable distance of Staffs, depending on which end you are.
 
Unless you get the head done,fit a new cam and a bigger carb you ain't gonna feel the difference and for that sort of money you could throw in a nice tdi or a V8
 
Crikey that money they want at Automotive comp is a bit silly. No, hang on, it's very silly. I want to keep the 2.25 engine but have considered things like a Tdi or a V8. However, my thinking is that the 2.25 is a good strong engine, it's underpowered on today's 'fast' roads (that's important) but I won't be using it on 'fast' roads. What I'd like to do is a rolling improvement project so, unleaded (and gas flowed probably) head, maybe a different cam etc. This is why I'm looking for a sports or bigger bore manifold and exhaust. At the moment the exhaust needs replacing so I'm thinking stainless as I'll keep the vehicle for a long time so the extra is worthwhile. While I'm going for a SS exhaust I may as well as go the whole hog and have that tubular manifold. So that's why I'm after one :)

I'll give MM 4x4 a call on Monday to see what they can offer me but somebody must have one a reasonable price somewhere..... I hope.

Cheers for the replies so far they are very much appreciated.

Take care.

Kevan
 
MM 4 x4 and Rimmers used to do these. Same supplier I think. But never did find out who. I have the ACR jobby, becuse the Rimmer/MM option was sold out. ACR version works, but fit is iffy on my series 109. (hits leaf sprong shackle boltson bumpy roads). Still not right as we speak, but to be fair may be an engine mount problem throwing the fit. Does give 'soem' minor grunt improvemnet. I also have SU carb, ACR heated manifild) but no head or cam... yet. So again, not really using it I think. The MM version is SS which is far better but the 4-2-1 junction is higher up, so will make it rev more, which along with the bigger bore than the ACR is likely to kill torque. Whearas Roland at ACR is the 2.25 & 2.5 petrol master. So I wonder at the wisdom of the MM systems 'boy racer science" larger bore. The MM system so big-bore could run a V8, which can't be right?? Bigger ain't alwasy better with exhuasts.
 
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Cheers mate. Worth bearing in mind because I have always thought it is better to have a bigger bore, within reason of course, to allow better engine breathing. This is a different matter entirely with a two stroke enigne but that is irrelevant here :)

Of course, my other option could be to fabricate a tubular manifold myself. I could then experiment with different sizes. The main obstacle here would be making the actual flange section itself. I'm sure I could find a local engineering firm to cut some blanks out for me and then grinding them out wouldn't be a problem (I used to do this for a living).
 
Surly if you noted down the dimensions and stud configurations you may be able to find one that fits from a different engine or at least one that could give you a good pattern to work from.
Just a thought as I have got nothing better to do whilst off sick (That's life I suppose LOL!!!!!!!!!!)
 
treeman said:
Surly if you noted down the dimensions and stud configurations you may be able to find one that fits from a different engine or at least one that could give you a good pattern to work from.
Just a thought as I have got nothing better to do whilst off sick (That's life I suppose LOL!!!!!!!!!!)
Click to expand...

Now that's somethng I hadn't thought of. It woould need to be of a similar size engine capacity of course. Or, as you say, similar bore size (dimensions). Perhaps one of the old Rover 4 cylinder ones may work?

Cheers.

Kevan
 
Definitely be careful with large bore exhausts. After all, if large bore was better, why bother with one t all! Bin it. I noticed, when mine was blowing it was noisy as f*ck but also gutless, so, you do need back pressure, and a pressure pulse in the pipe for better xtraction, which is not so unlike two stroke expansion pipes in principle. but how much is a black-art. So after this my knowledge becoems bar-room bull.
 
109SeriesIIA said:
Definitely be careful with large bore exhausts. After all, if large bore was better, why bother with one t all! Bin it. I noticed, when mine was blowing it was noisy as f*ck but also gutless, so, you do need back pressure, and a pressure pulse in the pipe for better xtraction, which is not so unlike two stroke expansion pipes in principle. but how much is a black-art. So after this my knowledge becoems bar-room bull.
Click to expand...

I have found A. Graham Bell's book on tuning 4 stroke exhausts very informative if not a little baffling at times. There's a lot of mathematics involved... He's also done a 2 stroke exhaust book which I also have but am yet to read.

Quite right about having to be careful about these things.
 
G-man said:
they won't flow as well as they could as the primaries are different lengths also as they are really fooking long you won't get as much scavenge as you might with shorter ones....but as your starting off with a boat anchor for an engine any improvements will be appreciated i guess
Click to expand...

Well done that man. I had only glanced at the picture and it didn't occur to me that the pipes were not all of equal length. For those who don't know, the ideal is that each pipe is equal in distance to the others. And yes, they are rather long. Though, both of those problems could be overcome with a hacksaw and the welding machine :)

Cheers.
 
Tubular Exhaust manifold Header for Series 2.5 or 2.25. I am to be corrected but that thar' is an ACR Powerplus jobby. See pix .... Like mine. I'll check later, but farly sure it is.

I also have the MM Big bore version in SS which I got ('used' for near sod all) after I'd lashed out on an ACR. Now discontinued by MM. Fitted it and makes for a tad more revvy engine than ACR version. So you see, I get to take my pick... eiher have mild steel ACR kit and watch my hard-earned rot or Big-bore SS and listen to it scream.

Maybe the pipes are off in length a tad, (on ACR one), but the physical diffciulty in the space limits absolutley correct piping( bending it to fit), I think. A compromise to get the longer pipe and thus low end grunt. Am I talking bol**cks?, but as I 'get it, those pipes 90 degree opposed must be matched, and in both versions htey are, but ACR hav it longer,. But this means pipe is more likley to ge 'clonked' at crucial joint. You can't ahve it all, eh?
 

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