Hipd heads
03-18-2019, 04:17 PM
#2
03-20-2019, 08:23 AM
#3
Stolen from a quick google search article off Engine Labs:
Roberts: HIP stands for Hot Isostatic Pressing, and it originated in the aerospace industry as a way of increasing strength and eliminating defects in metal castings. HIP will take a good casting and make it great by eliminating trapped gases and internal porosity in the casting. Every casting has trapped gases, or internal porosity; it’s the amount of trapped gas or porosity that determines the castings quality and structural integrity. Basically, the HIP process takes raw castings up to 970° F in a pressurized chamber with inert gas (up to 30,000 psi) and compresses the casting to reduce and eliminate any trapped gases. The result is an incredibly strong and dense sand casting that has three times the fatigue life and nearly the consistency of billet aluminum.
People have made 1500 fwhp with standard heads. I would say start thinking about it somewhere between 1500 and 2000 fwhp. Over 2,000 I think it would be a no brainer. If you are serious about this call someone like LJMS or BTR and discuss with them.
Roberts: HIP stands for Hot Isostatic Pressing, and it originated in the aerospace industry as a way of increasing strength and eliminating defects in metal castings. HIP will take a good casting and make it great by eliminating trapped gases and internal porosity in the casting. Every casting has trapped gases, or internal porosity; it’s the amount of trapped gas or porosity that determines the castings quality and structural integrity. Basically, the HIP process takes raw castings up to 970° F in a pressurized chamber with inert gas (up to 30,000 psi) and compresses the casting to reduce and eliminate any trapped gases. The result is an incredibly strong and dense sand casting that has three times the fatigue life and nearly the consistency of billet aluminum.
People have made 1500 fwhp with standard heads. I would say start thinking about it somewhere between 1500 and 2000 fwhp. Over 2,000 I think it would be a no brainer. If you are serious about this call someone like LJMS or BTR and discuss with them.
03-20-2019, 11:54 AM
#4
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03-20-2019, 12:48 PM
#6
Restricted User
I'm a fan of Tooley. Not so much Bewley. But the notion that's been spreading that you need to call them for everything, like how to replace a toilet or mow a checkered pattern in your lawn, is getting to be a bit dumb.
Everyone has their specialty. When you need the best advice on something, go to the specialist and stop turning everyone into the go-to guys. Tooley at least has an idea about casting quality, but I wouldn't say he is the guy to go to for recommended material density at X horsepower.
Bewley doesn't race, build engines, tune, fabricate, grind his own cams, etc. He's a hell of a salesman. Go to him for parts, its what he's damn good at.
03-20-2019, 01:09 PM
#7
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03-21-2019, 08:12 PM
#8
Bewley is a Facebook superstar, everywhere else hes a idiot. When I bought my cylinder heads I talked to the guy who makes AND sells them. When I had my engine built I brought it to a shop and listened to the guy actually building my engine. Weird concept I know but Fb racers dont understand.