Turbocharging a type 4 |
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Turbocharging a type 4 |
stownsen914 |
Oct 12 2016, 02:04 PM
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#1
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Senior Member Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
I have heard the conventional wisdom that "you can't turbocharge a type 4 successfully." Is it just difficult, or can it really not be done well? I'm tossing around the crazy idea of turbo'ing a type 4 for PCA club racing, to put in the chassis in my avatar. My 6 in its current configuration is not competitive, so I can put a bunch of money in that, or do something different. I like a challenge, so why wouldn't the following work?
- 1.8 or 2.0 type 4 as a base. I would keep displacement stock or close to it. - EFI for induction - Properly sized intercooler and huge oil cooler - A good aftermarket cooling fan - Would be dry sumped - I would work with a knowledgeable builder or shop to build the engine. I am not so familiar with type 4 race modifications, but presumably this would include reinforcing the bottom end, using Carrillo, Pauter, etc. rods - Obviously the heads would need to be reworked for flow and possibly reliability If I do the above, could a type 4 be built to withstand 15 psi of boost and make 350 hp reliably? Scott |
HAM Inc |
Oct 13 2016, 12:07 PM
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#2
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
When the chamber droops it takes the exhaust seat with it. None of our heads have ever suffered a seat failure as a result, but it does lose the valve seal.
You really get a good look at the impact of the droop when you flycut the head and cut the valve seat. This post on our FB site is an excellent example of a head that suffered this issue. These were new LE200's that were installed on a track car engine and saw very elevated egt's for long, full throttle runs. It developed high leak down around the valves, indicating it lost the valve job. Fortunately the owner stopped running before he blew the head-jug seal, which would have done major damage. In the pics we're cutting the ex seats. The layout die shows the low side. This one got hot enough to move the intake seats, too. That's some serious warpage! https://www.facebook.com/HoffmanAutomotiveM...e=3&theater These were new heads, but only God can make a cylinder head that heat won't hurt! |
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