shoestring
Well-known member
- Joined
- Jun 20, 2009
- Location
- Swampscott, 01907
Still sticking to my hot take on the B230 manifold being poo, however
And you would be correct.
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Still sticking to my hot take on the B230 manifold being poo, however
and of course the final results, before and after:
.050" 20.4 20.8
.100" 50.7 51.2
.150" 79.1 79.7
.200" 103.0 104.4
.250" 120.7 121.5
.300" 134.6 135.5
.350" 144.4 147.1 +1.9% (gainz not worth noting up to this point)
.400" 147.1 154.7 +5.2%
.450" 149.0 160.7 +7.8%
.500" 149.9 163.7 +9.2%
.550" 149.9 157.7 +5.2%
.600" 150.9 157.7 +4.5%
I was impressed with the results of the turd polishing effort.
In short it took us probably 6 months to figure out that we could get about a 20% improvement in the intake system. Knowing what we know now, I took this opportunity to order a custom cam from Jones Cams in Denver for this engine. We'll let you know how that goes...next Summer.
https://grabcad.com/library/volvo-b230f-intake-porting-tool-1
In case anyone's interested, here you go.
Compare the angle of the throat of the port relative to the mating flange to that of the runners on the manifold. My guess is that there is s sharp turn that does not exist in the other combination.
This is the prevailing theory for sure. We tested the B21F manifold on both heads and the results were much better for the 631. I think it'd work best with a more upswept manifold like on an M50/M52. I have the numbers but I can't find them at the moment. Looked like a pretty even trade off between the ported 530 with B21F intake and stock 631 with the same.
I think there's a decent amount of potential in this thing but it's too rare and strange to really be worth messing with.
I go away for a weekend and some weird stuff happens.
For anybody wanting to recreate this...
i don't think that will be a common issue.