chevy 502 exhaust reversion question???
12-12-2018, 03:44 PM
#31
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The first riser see pic below still reverted so I added 4" to the inner with a bell end (no punt intended lol) and this stopped all reversion it could idle all day long.
12-12-2018, 03:49 PM
#32
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12-13-2018, 12:44 PM
#34
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many things can promote water reversion. Alot of times it can be the waterline height - that height needs to meet a min distance from the bottom portion of the riser. to the waterline. One has to test that end with the boat in the water and how the boat is going to be loaded plus with a FULL tank of gas -- plus all the batteries, stereo equipment and so forth.
Next is idle settings - if too high at shut down - and the engine diesels -- that will cause reversion.
Ign. Timing can play into it as well for idle / rpm speeds / along with misfires if that is taking place as well.
exhaust manifolds and risers too cold -- creates condensation that runs down the internal walls into the exhaust ports.
and of course there is more along with the cam / valve overlap
Next is idle settings - if too high at shut down - and the engine diesels -- that will cause reversion.
Ign. Timing can play into it as well for idle / rpm speeds / along with misfires if that is taking place as well.
exhaust manifolds and risers too cold -- creates condensation that runs down the internal walls into the exhaust ports.
and of course there is more along with the cam / valve overlap
AS MENTIONED riser height is so important.as well.
if all possible one is better off using riser extension blocks for the exhaust manifold / riser combo
also dry to the tip will really help.
12-13-2018, 01:02 PM
#36
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12-13-2018, 01:07 PM
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