chevy 502 exhaust reversion question???
12-10-2018, 11:00 AM
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chevy 502 exhaust reversion question???
looking to buy a motor from a local guy. its a 600 hp 502. I'm concerned about reversion happening but I cant seem to find a good answer on if it will? cam duration @ .050 is 242.6 and 254.6. I have stainless marine manifolds and risers. the risers are about 18" plus long and the water exits the riser towards the back. close to the transom. seems with the way it exits and the angle of the risers where it mounts to the manifold and where it exits the boat it would be hard for the water to travel back up the exhaust. anybody know????
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12-10-2018, 12:47 PM
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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
Last edited by BUP; 12-10-2018 at 12:51 PM.
12-10-2018, 01:00 PM
#7
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placement of weight especially at rest or idling around
boat traveling in reverse
chopped the throttles quickly .
Seen many at party cove with like 10 people jumping around and hanging out on the swim decks, That is a huge water reverter. Those are the engine that hydro lock at party cove. Always know those and those call ins. .
boat traveling in reverse
chopped the throttles quickly .
Seen many at party cove with like 10 people jumping around and hanging out on the swim decks, That is a huge water reverter. Those are the engine that hydro lock at party cove. Always know those and those call ins. .
