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Message
Hi Rusty, I don't know if these will help or not, but here
are measurements of my intake which is "street" ported by Bruce T.
Funny, none of those
look like exhaust ports to me :-)
Since you posted the
intake runner pics, I have to speculate that Bruce does not do anything to the
size of these. If he did, it would cause you to have to make a custom
intake to match it. However, if you look at one of these 4 port housings,
you'll see that the secondary runners could be increased almost an inch at the
top of the runner. I was just looking at my intake today, and noticed that
I could easily take it out a quarter of an inch at the top, but I'm not sure how
much value that would be. The runner does seem kinda small for such a
large port inside. Perhaps someone who's water does down the drain the
wrong direction will comment :-)
For the record, I am
trying very hard to resist messing with the ports on the RV-3 engine, but I
can't promise success :-)
But now I have a question. What are the little holes below the
ports?
There is a round one on the end housings and a square one on the
center housing.
Well, mine are
rectangular on both the front and rear housing, and larger but still rectangular
on the center housing. Since my engine is in pieces, I can tell you that
these holes connect to the round holes that are below the exhaust ports.
My guess would be that these are channels for exhaust to heat the intake
manifold, but I admit that I don't really know for sure. I'm sure someone
here does though.
Cheers,
Rusty (converting from bent
mechanical flap handle to electric flaps)
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