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| Project 3400 Roller Cam Block (Page 25/82) |
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lou_dias
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JAN 21, 11:55 AM
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Joseph Upson
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JAN 21, 03:22 PM
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Compatible for what? an offset crankshaft grind considering the stock rods are 5.7".
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lou_dias
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JAN 21, 04:09 PM
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compatible with the stock crank journals...for the rod length to stroke ratio of 1.75:1
Stock 3.4 pistons go to below the deck and are dished. I'm using TDC 3.4 pistons and those are domed and don't hit the valves even using the 3.4 (thinner vs. 3400) gasket. I believe max lift using 2.8 style flat top pistons is .510" ... my current lift is .438" ... a .100" longer rod means I have to reduce .028" somewhere to be safe and the 3400 should cover that...
I want to bore my next block to 94mm (3.7") and be a 3.5L block with a perfect 1.75:1 ratio. My hope is the extra length lessens the need for 100 octane gas.[This message has been edited by lou_dias (edited 01-21-2013).]
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Joseph Upson
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JAN 21, 05:14 PM
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| quote | Originally posted by lou_dias:
compatible with the stock crank journals...for the rod length to stroke ratio of 1.75:1
Stock 3.4 pistons go to below the deck and are dished. I'm using TDC 3.4 pistons and those are domed and don't hit the valves even using the 3.4 (thinner vs. 3400) gasket. I believe max lift using 2.8 style flat top pistons is .510" ... my current lift is .438" ... a .100" longer rod means I have to reduce .028" somewhere to be safe and the 3400 should cover that...
I want to bore my next block to 94mm (3.7") and be a 3.5L block with a perfect 1.75:1 ratio. My hope is the extra length lessens the need for 100 octane gas.
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I'm not quite clear on what you're planning but it sounds like you're addressing the compression with a rod length change, without trying to guess otherwise, if that's the case I think you'll do better trying to avoid high octane by manipulating the cam LSA or duration, or both. Whatever the case you've got a plan.
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Will
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JAN 22, 01:52 PM
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lou_dias
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JAN 22, 03:49 PM
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Will
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JAN 22, 06:03 PM
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Is that block even still available?
It's strong enough for over 700 HP turbocharged. You won't miss the odd mm of bore size at that point.
Also, it could be sleeved for a larger bore. The technology is there to sleeve an aluminum bore block at 94mm on a 98mm bore center and have it strong enough to handle 18 psi of boost.
http://forums.bimmerforums....thread.php?t=1660617
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lou_dias
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JAN 22, 06:55 PM
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Must be nice to have deep pockets!
I don't know if the aluminum block is still available but in one of the catalogs, I was noticing GEN2 (Aluminum) heads look alot like GEN1 (Iron) heads. The exhaust ports look the same. Difference is mostly the intake ports where they meet the lower intake. Hey, I'll switch to aluminum GEN2 heads if it's simple...fabbing an upper intake similar to Trueleo shouldn't be too hard...
I need to sell my 4.9 5 speed before I start building another motor. I can probably get a Gen2 motor around here to source the heads and lower intake. I'd still keep the 3400 block.
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DefEddie
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JAN 22, 10:55 PM
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I've got a set of genII's from a tgp if you want to see pics.
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Will
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JAN 23, 10:57 AM
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| quote | Originally posted by lou_dias:
Must be nice to have deep pockets!
I don't know if the aluminum block is still available but in one of the catalogs, I was noticing GEN2 (Aluminum) heads look alot like GEN1 (Iron) heads. The exhaust ports look the same. Difference is mostly the intake ports where they meet the lower intake. Hey, I'll switch to aluminum GEN2 heads if it's simple...fabbing an upper intake similar to Trueleo shouldn't be too hard...
I need to sell my 4.9 5 speed before I start building another motor. I can probably get a Gen2 motor around here to source the heads and lower intake. I'd still keep the 3400 block. |
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Don't do that... the Gen II intake is a mess.
If you want aluminum heads, go at least to the late Gen III heads from a 3500. Heck, even use the non-VVT 3500 block, since it has a 94mm bore from the factory.
However, the VVT 3500's have 99mm bores and 76mm stroke...
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