Dear Gentlemen,
Every now again I get a hare-brained idea that I need to run by the Eng-Tips wizards. There is no other website that compares to this one when a fellow needs a correct answer. Here is my latest hare-brained notion...
I have a new set of stainless steel forged valves that go in...
I'm hot-rodding a Toyota 4AGZE, which is a 1600cc 4-valve supercharged motor. I would like to test the exhaust sealing ability of the valves by heating a closed valve with a propane torch (and then pressurizing the valve from the back side). Can someone give me a ball-park figure for the...
Today I was lining up a collection of ovate beehive valve springs (because I have that kind of time) from a Ford 4.6 DOHC 4-valve motor. While doing this, I noticed that roughly half the springs were wound to the right and half wound to the left. Is there any good reason why Ford would specify...
Dear Gentlemen,
I've been rebuilding the supercharger from 1989 Toyota MR2. Here in the States, the car is officially an antique. The supercharger is an OEM factory (Toyota SC12), self contained unit which has a pair of flat roots-type paddles. I am having trouble finding replacements for the...
Dear Gentlemen,
I have another head scratcher that's really been squeezing my melon ever more and more. Here's what I don't get...
Let us take, for example, two engines like the Ford 4.6 sohc and the Ford 4.6 dohc. Both motors are fuel injected, metered by mass air amd O2 sensors, have...
Dear Gentleman,
Seasons greetings! I sent a pair of 4.6L DOHC Ford Cobra heads to be CNC ported. When I got the heads back, to my dismay, the exhaust ports where ported all the way out to the gasket edges. Doesn't this violate a cardinal rule to gasket-match the exhaust ports? Every book...
I have been modifying a Ford 4.6L dohc (modular) motor for about a year now. After close study, I conclude that the stock cams cannot withstand the added stress of after market (high pressure) springs. Reason? Hollow cams.
For the mod motor, Ford perfected a method of setting cam lobes on a...
I am putting together a 4.6L Ford V8 modular (alloy block). The bores have been bored to 3.572". The gauge point on the CP branded pistons is 0.5" from the bottom of the skirt and at this point they measure 3.5685". However, these pistons flare towards the bottom of the skirt where the...
Dear Gentlemen,
I rarely post to this forum but read what you fellows post... all the time. There is no other forum that quite compares to this one. And Pat Primer, you're the shizzle. Here is a question that's had me thinking for the past year...
If a turbocharger depends on high pressure...
Knowing the heat of evaporation of water is huge, why not take the hot air from a turbocharger and run it through, what is essentially, a household swamp cooler? It seems that would be the most effective way to get cool, compressed air to the intake ports. The humidified charge would not burn...
I know the engineering firm providing hot honing equipment is in Phoenix but I have not been able to find a commercial machine shop in the Southwest (preferably Southern California) who offers this service. I would like to experiment with it. Anybody know of shops offering hot hone jobs?
