Subject: Re: dynamic compression question by rklessdriver on 2014/2/14 20:26:52
I'm not interested in emissions and I'm not talking about thermostat temp ratings.
Every engine I have ever dyno'd made considerablly more HP with the coolant temp ice cold (and the oil temp boiling hot).
Everytime I race my 84 I use an oil heater to make sure the oil temp is over 200F and I tow it to the lanes or crank and coast it - so to keep the coolant temp as low as I can.
Cool cyl head temps make more HP. They are also more detonation resistant. Thats why I told hm what I did in reguard to coolant temps and running it hard.
When your dealing with nearly 12.1 compression on pump gas using a wedge chamber and a relitivley small camshaft, the motor is going to have a bunch of cyl pressure. You need all the help you can get to make it not detonate and coolant temp is all he can control to help.
If you heat soak an engine like he is building and then go make a few full power WOT pulls - it's gonna burn a piston in no time. Will
Quote:
Blade_1 wrote: Quote:
rklessdriver wrote: Choice 2, is what I would do, as long as you have 2800-3200 stall.
I would also caution you about the engine coolant temp. Do not go out driving it around in traffic and then beat on it with high coolant temps and lots of underhood heat/heat soaked. Try to keep it around 160-180*F coolant temps at the start of a run.
What is really important is the cyl head temps around the chamber - but all we can actually monitor is the coolant temps. Will
Yup - lower squeeze Matt, not just for lower running temps, but motor last longer with lower compression (all else equal).
And remember rkless; 'stat rating is only the temp at which stat opens - it doesn't keep the motor running at that temp...
160' coolant temp is too low for good burn. 180' is borderline. 195' - 200' is optimum.
I don't know why anyone would want their mill to NOT go Closed Loop til later...
