Multi69s
Samba Member
Joined: January 24, 2006
Posts: 5363
Location: Lefty, CA
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 Posted: Fri Jun 26, 2015 11:46 pm Post subject: Should I have larger valves installed in my heads |
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Well I was struck with the infamous Type 4 valve seat dropping. So I need to get one head fixed, and the other rebuilt. As I was getting quotes, one of the respected Type 4 rebuilders said that I should go with bigger valves when I have them replace the seats. They especially mentioned the exhaust valve, because it will help the engine to run cooler.
Just a few engine specs: The motor itself is pretty mild. It is a 2L, with a Scat C25 cam (Lift - 0.455", Duration – 272, Duration @ 0.50 - 234), ported and polished 1700 heads with 8:1, 0.045 deck. Balanced stock rods (end to end & total) 914 P&C, Solid spacer 1700 rocker arms with swivel adjusters. 72-74 heater boxes with thunderbird header, Suzuki Hayabusa muffler, and dual Weber 40DCNFs.
The motor is actually in a Squareback, with an automatic transaxle. So because of the automatic, I really don’t see very high RPMs due to the shift points (I rarely row the shifter). So, if I go to larger valves, will I see any advantage and / or will I lose torque? I am posting here, because you folks know more about the Type 4 engine, then the folks in the Type 3 forum.
Also, for the head work, I have narrowed it down to two shops: European Motor Works, and Headflow Masters. Any thoughts? Thank you
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69 road Bug 2110
73 Squareback - 2L, T4, Automatic W/ AC
Gone, but many fond memories 69 Baja Bug 2010 - 5 Rib Bus Transaxle
Gone but not forgotten 72 Baja Bug 2010
My builds
T4 into Squareback http://www.thesamba.com/vw/forum/viewtopic.php?t=458944&highlight=
Auto Trans Rebuild http://www.thesamba.com/vw/forum/viewtopic.php?t=516066&highlight=
AC in Squareback https://www.thesamba.com/vw/forum/viewtopic.php?t=...highlight= |
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