To all Hi,
Recieved some other info re baffling and exit ramps for a Cheetah
Where are you located? Dave is speaking about the exit ramps in the bottom
cowl. My 78 Cheetah has metal exit ramps I believe the earlier ones have
fiberglass ramps. The heat and time can weaken the exits and the center of
it sags down narrowing the exit opening.
http://www.bondline.org/wiki/Lower_Cowling_Split
http://www.bondline.org/wiki/Engine_Baffles
These are some links that also
might help.
Some other factors are:
-Replacement lightweight starters are often installed poorly. The front
metal baffle has to be trimmed and flexible baffle material installed around
it. Many mechanics don't take the time to do this.
-The flexible baffle material that seals between the nosecowl and the fixed
metal front baffle have to be in GREAT shape. There are many places where
cooling air can be lost. These cant be seen without removing the fiberglass
nosecowl. If you have the split cowl then you don't need to take the prop
off otherwise you do.
-Top baffles have to be in GREAT shape, essentially all baffles have to be
in great shape.
-What CHT gauge do you have? JPI reads higher that EI and is more accurate
in my opinion. So if you have a temp of 454 with a EI (Electronic
International) your temp may actually be higher. The JPI CHT probe is spring
loaded and actually touches the cyl head. The EI CHT probe screws into the
cyl assy but doesn't actually touch the cyl except where the threads are.
My HC Cheetah can get into the 420s while climbing with a JPI probe. It used
to be worse. I have great baffles, rebuilt the exit ramps and made them
larger. I also have sealed the space between the prop spinner and the
nosecowl. I agree that your 454 is to high.
answered
Mar 18 '11 at 10:36
Tunahawk
51●1
Silly but required question:
You've swapped the probes, right? Both at the engine and at the monitor? Do you have any evidence of overheating besides the monitor?
@Jim Those are great questions. No, I have not swapped probes. I will do that and check again. I am not sure what other evidence there can be - any ideas?