Porting and Port shaping Round 2 (pics)
01-23-2009, 11:08 PM
#31
Rennlist Member
Thread Starter
There is no flame in the intake port. If the head surface itself ever gets above 350 degrees, there are other very serious problems. Why would I want to test it that way?
01-24-2009, 01:30 AM
#32
Rennlist Member
Brendan, IMHO the fuel is not really the issue. At most it will slowly erode the JB Weld.
The factors that I think make it unsuitable are TCE(Potentially, not sure on this), the fact that it will have an engine hammering on the casting, occasional detonation/knock especially during initial setup, and heat cycling. The head can easily get well over 250° when heat soaked after running, especially if you're making big power.
The factors that I think make it unsuitable are TCE(Potentially, not sure on this), the fact that it will have an engine hammering on the casting, occasional detonation/knock especially during initial setup, and heat cycling. The head can easily get well over 250° when heat soaked after running, especially if you're making big power.
01-25-2009, 12:31 AM
#33
Three Wheelin'
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I have a solution for your concerns:
get rid of those US heads, and use a set of Euro heads. even a set of early Euro heads will do (non-''S'', same valve and port sizes as the US heads, but no intake side injection holes).
no holes in the intake ports, only air injection holes on the exhaust side.
Euro "S" heads equal bigger valves, bigger ports........and no one calling you an idiot for trying something different (filling the holes with anything but welding them up)---no offense to you personally.
there have been two sets for sale here this month alone, for less than $500 per pair.
problem solved.
--Russ
get rid of those US heads, and use a set of Euro heads. even a set of early Euro heads will do (non-''S'', same valve and port sizes as the US heads, but no intake side injection holes).
no holes in the intake ports, only air injection holes on the exhaust side.
Euro "S" heads equal bigger valves, bigger ports........and no one calling you an idiot for trying something different (filling the holes with anything but welding them up)---no offense to you personally.
there have been two sets for sale here this month alone, for less than $500 per pair.
problem solved.
--Russ
01-25-2009, 02:19 AM
#34
Shameful Thread Killer
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Rennlist Member
I read the mototune info. It looks good, lots of things I agree with. JB weld is not one of them. They also confirm what I said initially, you're making changes without any way of testing the results. If you're in El Cajon, go out to the Ford dealership, and go back in the service area. Ask for Ric M. He's been building engines for + 30 years. Show him what you're trying to do, and listen to what he has to say.
01-25-2009, 10:26 AM
#35
Racer
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I used High temp JB weld in a custom built aluminum intake I built to aid in runner transition but it is strickly an air passage. No fuel runs across it. I bought a BMW once with a cracked oil pan. The P.O. repaired it with JB weld. The oil soaked into the epoxy and caused the patch to fall off while my wife was driving the car down the freeway. Needless to say it cost me an engine.
