Stage 2 LCB header question?
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Once I found what you found on MM I was able to look more closely at the Maniflow website. They have carefully chosen their words ("type of vortex" and similar wording).
You can read more about what Maniflow have done and their claims in the link below.
https://www.maniflow.co.uk/index.php?view=page&page=52
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What I want to ask is... where did Maniflow say the LCB did anything with "vortex scavenging"?
Scavenging was mentioned in post #1 by the OP but I did not find it on the Maniflow LCB webpage(s).
“Maniflow improved on their LCB design by enlarging and shaping the middle pipe which creates a type of vortex, simulating a pulsing effect similar to the outside two pipes, thus producing an improved BHP, torque and power curve. In conjunction with top Mini racing engineers, this design has won all the major Mini Championships.“
doesn’t say anything at all about vortex scavenging, just creates a type of vortex to simulate pulse effect.
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What I want to ask is... where did Maniflow say the LCB did anything with "vortex scavenging"?
Scavenging was mentioned in post #1 by the OP but I did not find it on the Maniflow LCB webpage(s).
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I dunno about "vortex scavenging" (probably marketing baloney) but a properly tuned Mini exhaust does its own form of scavenging. When an exhaust pulse reaches the end of the tailpipe (or somewhere), it induces a negative pressure pulse that helps draw exhaust. I have seen this in action on my Mini: at idle, exhaust pulses push a suspended paper towel away from the tailpipe tip and the resulting negative pulse sucks it back in, to the point the paper towel shreds.
Specs: 1275 high compression engine, Freeflow header, 1.75 Stainless steel RC40 exhaust system with single muffler.
Have a browse over this:
https://www.calverst.com/technical-info/exhausts-rc40-millennium-and-others-tested/
.
"Hang on a minute lads....I've got a great idea."
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In 30 years I've had 2 ..and both were fine. What did they say when you complained?
Cheers, Ian
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I did put the stage2 on my +.060 performance build with 286ish cam because I didn't want to go for the big ol' 2" exhaust.
I can tell you that the lcb manifolds are a PITA to get/keep sealed if you are someone who takes his engine in and out a lot. That Y piece sucks and the band clamp joints always seem to leak in time, usually from engine moving different than the exhaust is moving.
The cooper freeflow only has 1 joint/clamp where the lcb types have 3.
Oh, and as a warning I wouldn't go singing praises of Maniflow for their super-duper high quality mumbo-jumbo just because of their name. I have a steel dual carb hif manifold of theirs that has mounting faces so out of wack from one another I've never put it on and have had it probably 10 years. Welds look like they came from the Colgate factory. Not inexpensive, either.
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Cheers, Ian
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Your main risk is whether the cheaper item will fit ..or how much work you have to do to make it so..
Based on Maniflow's experience and reputation (they grew out of the original Downton) you will get what you pay for...
Cheers, Ian
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The car has a 1275cc .040 over (is that a 1310cc?), 12G940 11 bolt head, aluminum intake with a Weber 32/36, oil cooler, 1.75” single box exhaust front to back. I was told it only has around 400 miles on the engine rebuild and I have no reason to doubt that. It’s very clean inside with no carbon on the pistons. I have no idea about the cam, gears, clutch.
I’m leaning towards getting the stage 2 LCB from Maniflow, it’s the one with the modified center branch for some sort of vortex pulse magic. It’s not a huge amount of money extra and I feel like extra exhaust flow would be better anyways. The description sounds good but we all know that performance part descriptions are for loosening purse strings. Based on what my engine has I figure I wouldn’t be wasting my money. Anyone have experience with this LCB? I’d love to hear some first hand experience. Would I just be pissing my money away?