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| Project 3400 Roller Cam Block (Page 41/82) |
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Will
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MAY 13, 09:47 AM
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It sounded like what he was saying is that because the bore spacing is the same, it's a safe overbore because the distance between bores is not less than it is on a stock 3500...
Maybe I jumped the gun in thinking that he meant that.
It's a big overbore and maybe any given block can take it, maybe not. That much overbore should be preceded by a sonic check.
However, the LX9 blocks are so cheap that there's no reason not to use one.
Personally, if I were building a pushrod V6, not using the 99mm blocks, I'd use the LX9 block and go to 3.736 to use 305 Chevy pistons.[This message has been edited by Will (edited 05-13-2013).]
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carbon
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MAY 13, 10:35 AM
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| quote | Originally posted by Will:
It's a big overbore and maybe any given block can take it, maybe not. That much overbore should be preceded by a sonic check.
However, the LX9 blocks are so cheap that there's no reason not to use one.
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True... not all 2.8 blocks will survive being bored out to the 3.4 spec either.
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lou_dias
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MAY 13, 11:13 AM
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| quote | Originally posted by carbon:
True... not all 2.8 blocks will survive being bored out to the 3.4 spec either. |
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I'm using a 2001 LA1 block bored .020" over. From the machinist's catalog, pistons are available up to .060" over, iirc. At .080" over, it's the same bore as stock 3500 LX9 pistons which are 3.7".
The LX9 is supposed to be based on the 3400, but with a 3.7" bore. http://en.wikipedia.org/wik...igh_Value_engine#LX9
Seems like the same crank so it should handle the over-bore. UNLESS they changed the 3400 in 2004... Can anyone confirm or refute a crank change from 2004+ compared to <2004?
It's possible that once they changed to the "high value" branding that the block got slightly longer and wider to accommodate the 3.5L in 2004 is what I'm saying and that means that all the parts would have changed then as well.[This message has been edited by lou_dias (edited 05-13-2013).]
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Joseph Upson
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MAY 13, 04:12 PM
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| quote | Originally posted by carbon:
There is no way to reach the specs of the VVT engines with either the LA1 or LX9 block.
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An offset ground steel 3500 crank along with Honda Accord V6 H-beam rods, the chevy version that use a ~1.8xx crank throw
| quote | Originally posted by Will:
Personally, if I were building a pushrod V6, not using the 99mm blocks, I'd use the LX9 block and go to 3.736 to use 305 Chevy pistons.
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That would be a challenge unless there are 305 pistons in production with a compression height short enough to work with the rod and stroke combo. The 3.6L pistons are 94 mm also and flat top except for the valve reliefs and would probably be easier to adapt. A connecting rod shorter than 5.6" may get you in clearance trouble with the crankshaft, the single oil squirter or both on the LX9 block or dangerously close.
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carbon
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MAY 13, 04:16 PM
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Well then... I stand corrected. There is always a way. 
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Will
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MAY 13, 06:59 PM
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| quote | Originally posted by Joseph Upson:
That would be a challenge unless there are 305 pistons in production with a compression height short enough to work with the rod and stroke combo. The 3.6L pistons are 94 mm also and flat top except for the valve reliefs and would probably be easier to adapt. A connecting rod shorter than 5.6" may get you in clearance trouble with the crankshaft, the single oil squirter or both on the LX9 block or dangerously close. |
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At least Keith Black and maybe other manufacturers make extremely short pistons for SBC's with 3.750 stroke and 6.000 rods in the 305 bore. The resulting engine would be a 331, and would probably make a very nice towing engine due to the low surface area to volume ratio of the cylinders.
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lou_dias
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MAY 16, 02:51 PM
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Headlight assemblies have been removed.
A/C compressor and bracket removed.
New wheels and tires installed.
Alignment done.
Rodney's pulley installed.
Now I just need to add back some timing below 3000rpm, take it to a dyno and see what else I can tune into it...
1st race is the 26th...(10 days from now)
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lou_dias
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MAY 22, 04:43 PM
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My friend is helping me remove the speakers on Saturday.
While he's taking care of most of that, I'm gonna load up the current chip and reflash and burn a new one with more timing below 3000rpm. I think the cut-off is 2800 actually.
I'll get a dyno by the end of June, hopefully.
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carbon
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MAY 24, 11:35 AM
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Race day is Sunday? Is the car ready? Get some pics!
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lou_dias
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MAY 24, 04:17 PM
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| quote | Originally posted by carbon:
Race day is Sunday? Is the car ready? Get some pics! |
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The only thing different externally is the wheels in the back were moved to the front and the back got new set of rims and 275/35/17 Hoosier R6 tires. These tires may not be allowed on the track.
It's supposed to rain Sunday so I hope the sun comes out. I'd hate to have done all this work to get it ready just to be pushed off a week.
Gonna replace my leather seats with speakers in them with some older cloth stock seats. Gonna remove speakers from the sail panels and dash and remove the subwoofer. All this tomorrow.
I've already removed the A/C compressor and bracket and headlight assemblies... My goal was 100lbs. Would have liked to have added the Norm's fiberglass front end but 2 trips to Vegas (going again June 5) won't allow it.
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