os12tz cut all but 2 cooling fins????worried

[mike burt]

I cut all cooling fins but 2.My question is will this still keep cool enough.Iam a little worried about it.Everyone isnt running water cooled in jae12g2 they say to cut most of the head off should i worry or should i look for water cooled head???

 

[Kevin Krogness]

Run her a bit rich until you find the sweet spot, you should be fine...

 

[gil sonsino]

Mike on my Nova .15 I have three fins and the motor runs great I hope your mod works.and keep the needle on the rich side at the beginning.Gill

 

[Glenn Quarles]

Mike, if you are running good fuel then a hot run won't hurt your motor. 2 fins sounds about right, (but it also depends on other factors).

When I first got the .21 5 port motors in I ran one for all of the break-in and 2 complete races (in the hot TX/NM summer) with never a single drop of water cooling! It ran great each heat until either just after the race or on the last lap and then it would just quit from the heat. I tried to see what the extreme abuse was going to do...after getting it so hot that it just quit about 5 or 6 times it still feels fine and I continue to run it even now with the same bearings, rod, etc.

I would say just run your motor and if it acts like it is getting hot, just bring it in and richen it up. I you are not able to keep it from overheating with needle adjustments, then it will be time for more cooling fins or water.

Glenn

Mike, I guess I should add that this is with a Nova motor. I'm not sure what alloy OS uses in their P/S and how it will hold up to the heat.

 

[Rigged]

not a TZ, but i abused the hell out of one of my 18CVR's in a car with only 2 fins and never had any overheating problems. Of course this was in a car, but it was wide open from the time it got started til it ran out of fuel.. would think as long as you dont try loading it too hard, should be fine.