exhaust manifold?! how come?
exhaust manifold?! how come?
I have the b230a, the spec is 531 head i ported this myself i think the bit i may have done wrong is port the exhaust ports to the size of the gasket? , standard valves, t5 300 deg cam, compression up around 11:1 or more. Its on the LH2.4 type injection manifold, with microsquirt. Its working well.
I had it mapped with the cast type manifold, 50mm down pipes into 63mm system, it made 166 bhp
I had it mapped again with a scandix? manifold, tubular one, that went 4-2-1, although i modified it to fit RWD car and the BMW, all the tunes i modded where the same length as it was. Now, back to the same rollers and it was 160 bhp
It had lost 6 bhp. Is it the head porting? or is it just better to have the cast? i am thinking of going back to the cast one...
thanks!
I had it mapped with the cast type manifold, 50mm down pipes into 63mm system, it made 166 bhp
I had it mapped again with a scandix? manifold, tubular one, that went 4-2-1, although i modified it to fit RWD car and the BMW, all the tunes i modded where the same length as it was. Now, back to the same rollers and it was 160 bhp
It had lost 6 bhp. Is it the head porting? or is it just better to have the cast? i am thinking of going back to the cast one...
thanks!
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- Topplocks-guru
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Re: exhaust manifold?! how come?
It seems like the cast manifold worked better.
But it can be that your engine runs to lean now too.
Erland
But it can be that your engine runs to lean now too.
Erland
Re: exhaust manifold?! how come?
yes ill have to get the old map put into it and checked.
i just presumed the manifold was really restricting it. I dont know if it will now with the lh2.4 style inlet.
i just presumed the manifold was really restricting it. I dont know if it will now with the lh2.4 style inlet.
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- Topplocks-guru
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Re: exhaust manifold?! how come?
The B230F manifold is really restrictive.
I ported a 405 head for a group A engine with stock valves and got 205 CFM:s at 12mm lift.
With the nmanifold attached flow dropped to 165 CFM.
Erland
I ported a 405 head for a group A engine with stock valves and got 205 CFM:s at 12mm lift.
With the nmanifold attached flow dropped to 165 CFM.
Erland
Re: exhaust manifold?! how come?
So it doesn't matter what cylinder head you put on B230 engine, if you use B230F intake manifold? Or how much stock 530 and F-manifold flows together?
Re: exhaust manifold?! how come?
is there any way to flow it better ? I either have to use 2 carbs, which i dont want to do, or use the standard injection fitted to that engine type for my rallying. The K-jet dosnt have "normal" injectors, only the F type. Im at 166 bhp, if i can get more id be happy!
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Re: exhaust manifold?! how come?
what is the rules for intakes? Modify, fabricate, replace?
https://shop.klracing.se/sv/artiklar/vo ... jall-.html
https://shop.klracing.se/sv/artiklar/vo ... jall-.html
Re: exhaust manifold?! how come?
has to be a totally factory part! you mod it at your own risk of getting caught
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Re: exhaust manifold?! how come?
oh that looks really interesting!! i never heard of it before, will research that! thankyou
Re: exhaust manifold?! how come?
We tried this for about thirty years ago , maybe its a solution.
Cheating, of course
https://www.extrudehoneafm.com/service- ... rlotte-nc/
Gaston
Cheating, of course
https://www.extrudehoneafm.com/service- ... rlotte-nc/
Gaston
Re: exhaust manifold?! how come?
fulsnut skrev: ↑fre feb 18, 2022 10:22 pm We tried this for about thirty years ago , maybe its a solution.
Cheating, of course
https://www.extrudehoneafm.com/service- ... rlotte-nc/
Gaston
yes that is exactly what id do but no one does it over in the Uk that i know of, and also i hear it is expensive?
Re: exhaust manifold?! how come?
The main advantage was that it took the most at the outer edge of the radius.
I don't remember if it was expensive.
(correct English)?
I don't remember if it was expensive.
(correct English)?
Re: exhaust manifold?! how come?
what bhp did you end up with? I think my lh2.4 is really restricting my engine now.
Re: exhaust manifold?! how come?
It was in a boat with B21E and first we tried with blasting sand.
Then we tried the extruder.
Maybe it gave us a few more knots.
Erland is the expert
Then we tried the extruder.
Maybe it gave us a few more knots.
Erland is the expert