Rage

Thanks to all who take the time to share their thoughts.

My 496HO is heavily modified though still naturaly aspirated. An important fact seems to be that it is closed cooling as apposed to open cooling (straight sea water) so things are not as cool. I have replaced the 160F coolant thermostat with a 120F thermostat and the coolant peaks at 140F during long extended WOT running. Anecdotal evidence is that oil temperatures with open cooling run a lot cooler than when engine cooling is closed ie through a heat exchanger. Oil bypass in the block has been changed to 30 psi. Ignition timing is 28 degrees, same as GM's HP3 Vortec racing engine that I have emulated. I run 12.5 AFR at WOT which I am told is generally accepted as optimum range for a marine engine.

Thanks again for your input.

SDFever

Unless you're privileged, there is no adjusting timing advance on this engine. The timing on the 555 is non-adjustable without reprogramming.

Rage, if I read your posts correctly, 15 minutes seems like eternity to hold any engine at wot. Just my opinion. I have never come close to that nor would I.

Does it take 15 minutes or almost 15 minutes before you are unhappy with your oil temps? If so, and if you could run that long at wot, I'd consider it a "back off" warning and give it a rest.

Don't forget that pretty much everyone's product ratings are a "best case" scenario and anything maxed out for very long will come up short.

From talking to you in the past I'm sure you know this. But with all due respect, how long would you typically like to hold it open before bumping the throttle down??

Rage

Correction 32 degrees timing for the HP3 race engine is what I am running.

Rage

My PCM555 ECU timing can and has been modified at my direction c/o Dustin Whipple as well as extensive fuel table modifications to get my engine modifications in line with appropriate AFR's / rpm.

It all depends who I am running against as to how long I hold the pedal to the metal. Poker runs are only one example of notoriously extended hard running. It mostly depends on your disposition/goals. I do not want to be a slave to runaway oil temperatures.

Thanks for your comments.

SDFever

Well, your answer pretty much narrows it down.

I have a budget and you do not.

Man, I hate budgets.

TWIN-SPINS

how about ,,to much oil volume,,going thru the cooler,to cool the oil down,,,,my thoughts are would a stock oil pump work better

Mr. Cool

Twin Spins: Unless you get air in the line (cavitation), too much oil can only turn into a knife and erode and eventually destroy the inside of the tubes inside of the cooler. But that's pretty high flow, not realistic in most cases. Higher volumes max out the cooling saturation of the cooler design. And Rage gave his water and oil flows early on and it was fine. So I still think it's something different.

I sent Rage a PM with more information which I will post probably tomorrow. I have someone checking my logic before posting.

My opinion/What I'm thinking: corrosion or poor operation of the thermostat so it is getting excessive bypass, crud blocking flow in the cooler oil side, or aluminum oxide on the cooler inside. That oxide can be removed with toilet bowl cleaner left in the cooler for a couple of hours (clean first of course).

The cooler design is fine. It's something else. Rage: What's your next step?

Do what I said in PM for the stat first and clean it off. Or, if you pay the shipping, I'll send you a new one just to see if it fixes it. Note we're a competitor, so this isn't warranty.

Russ

Mr. Cool

Quote from you: "...My 496HO is heavily modified though still naturaly aspirated. An important fact seems to be that it is closed cooling as apposed to open cooling (straight sea water) so things are not as cool. ..."

Rage: This is important. If you're getting air in your incoming water (of course you are), every air molecule in essence does NOT transfer heat (well not much). This can substantially reduce the efficiency of the cooler. You might just need a bigger one to compensate for the lack of efficiency. You're sealing off the cooler early on so it's not engine temperature. As fast as you're running, I don't know how you'll keep the air out. Maybe you'll need to up size?

Did it ever work at any point in time?

If not, I'm more leaning this way now. I think the logical reason you're increasing in temp over time is that the cooling system (flow, hardware, etc) can't compensate for the engine's heat rejection. Consider the other things I wrote (not the cleaning yet) and post the results.



Russ

smiklos@sunprint

iTrader: (1)

Rage are you running a stock oil pan? If so what oil level are you running? Innovation found windage issues back in 2002 and made some mods.
Thanks
Steve

TWIN-SPINS

would sea strainers help,,,if not the reg size,,, the larger ones , iam wondering if the larger volum would help reduce the air in the water problem you mr.cooler,,,talks about,,