Performance Forums > V6 or Straight 6 Engines
exhaust manifolds
the old trucker:
I got an email the other day about the 251 engine specs. I thought it may help.
here is some specs for the engine. spark plug gap .035 point gap .020 firing order 153624. timing is 0 degrees b.t.d.c. valve adjustment exhaust .010h intake .010h
The email below is about manifolds.
the 251 engine is the same one that is used in the cars and trucks.the only difference in the industrial engine is that it has 4 ring pistons and the car-truck engine had 3 ring.there were different manifolds made for those engines but they will all fit.
Averyman:
bluetoque... have you found a cure for that red hot manifold ?
bluetoque:
I removed the clutch fan and installed a conventional fan,there is alot more air movement now so hopefully will help .We are going up to the rally so will be able to show the bombardier guros first hand of red hot exhaust pipes.
the old trucker:
--- Quote from: bluetoque on January 15, 2009, 08:11:12 pm ---The jury is still out but I think it may be as a result of a faulty clutch fan....I dont think there is enough air movement with a thermosatic controled fan to disapate the heat created in the engine compartment. We installed an exhaust fan simmilar to Skenmans and it does help for sure. We are going to change it to a direct drive fan and try that .
--- End quote ---
bluetoque, I was talking to a mechanic today & he thinks with the fan hauling in cold air, & the engine giving off so much heat at the same time, it's hard for the air to circulate properly. He was thinking if there was a big enough fan pushing out air out through the rad the fresh cold air should draw in through the motor doors. Any thought on that idea ??
BTW : Thanks again for the info you sent to me. The Old Trucker
bluetoque:
OT You cant reverse the fan to push air back thro the rad . It sounds good and its used in various applications but not on any bugs that I have ever seen.If Woodsy reads this I hope he will comment as those kind of guys put these machines to the test year after year.The 300 I put in my narrow ga steel runs hot when its working hard.I use strong antifreeze and a 17# cap...It runs in the red but does not boil over .We use a plastic jug as a collector from over flow tube and with this if it blows off it will reguritate the antifreze so you dont have to add unless you get her real steamed up.In my experience when I blocked off the air flow to the front It only makes matters worse when its tough going..it might be so hot inside you cant breathe but at least you are still going..another thing turn every heater on you got it cant get any hotter inside. Keep the beer up front!!
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