Offshoreonly.com - How much reversion is too much??

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Are you gaining oil/water? Is the milky oil all up the dipstick or are you seeing condensation on the head and top end components after a long idle? There is a difference. I get condensation with my aluminum heads and low water temps. I use to think it was reversion and I had Stainless Marine TRS dry to the tip tails.

Scott, you could weld extensions on to your current tails, and make them fully dry to the tip.

I've got 540's with 500EFI intakes and cams. I bought some like-new Gil HP500 risers not realizing they had reversion issues. They're so low and therefore the drop is so minimal it's a wonder to me that they could work with any set-up. After wasting a lot of money trying to fix them I finally had the inner tubes extended through the transom to make them dry. Problem solved. They're a little loud, but with slip-in mufflers it's not too obnoxious. Based on my experience, I wouldn't waste my time trying other alterations or band-aids like timing changes etc. If your Gil manifolds have been fresh-water only I doubt they're the problem but they aren't hard to pressure test.

Quote:

Originally Posted by Black Baja (Post 4486567)

Just an FYI Stainless Marine sells an adapter to go from Gil to there tails. You could go dry all the way out the transom...

Good to know.

Do the SM tails for the Gill's have their 'Dam' in them like in their tails for their own manifolds ?

no silent choice on right ? if no, exhaust will need to be changed

Would sound sweet too lol

Quote:

Originally Posted by MILD THUNDER (Post 4486895)

Scott, you could weld extensions on to your current tails, and make them fully dry to the tip.

Quote:

Originally Posted by 14 apache (Post 4486612)

More timing the less cylinder pressure you will have at idle and it will run smother will act like a smaller camshaft.

You might be able to put a Daytona sensors cdi with a boost retard.

24* head hunter 598 at 10to1 I would run 45* at idle and engine would smooth out. And you can close the trotted plates down a bunch lowering cylinder pressure..

I run 27/28* locked initial timing with a 900rpm idle in neutral(6M MSD). It has a super strong idle in gear. Not sure if the higher initial timing causes more reversion or not, seems to be a little controversy about it. Not here to argue. I know there are better ways to control my timing, but this works and runs real well.

LE

Quote:

Originally Posted by Rookie (Post 4486835)

The problem that arose this year was that the oil actually got milky after the extended idle times. The oil surprisingly cleaned up very well after running at operating temps for 20mins or so. I do however get some condensation on the bottom of my breathers also, which I attribute to the low water temps this combo runs, but those too clean up after running at temps for awhile.

I'm sure with the HP525 cams and the OE 500HP Gils that there has to be some reversion, and I figured there was. It just never seemed to present itself over the past, and I guess I didn't worry about it. I'll be looking into new risers and or modifying the ones I have.

LE

Quote:

Originally Posted by ezstriper (Post 4487228)

no silent choice on right ? if no, exhaust will need to be changed

Nope, just OE HP500 risers from 98'.

LE

Quote:

Originally Posted by MILD THUNDER (Post 4486895)

Scott, you could weld extensions on to your current tails, and make them fully dry to the tip.

I plan on pulling the exhaust, inspecting and pressure checking both systems. I also had O2 bungs welded into all 4 risers awhile back, and I want to make sure no cracks or failed weld happened as well.

If all looks good with the risers, I think I will have some extensions welded into them.

LE