 
     |
| Project 3400 Roller Cam Block (Page 40/82) |
|
carbon
|
MAY 10, 09:25 AM
|
|
|
|
|
lou_dias
|
MAY 10, 11:35 AM
|
|
| quote | Originally posted by carbon:
But it rolls? |
|
Yes, and I just ordered 2 17x9 wheels from Summit and 2 P275/35ZR-17 Hoosier R6 tires. Gonna use those in the rear to get my rpm up on the track and move the 40's to the front with lower tire pressure.
http://www.summitracing.com/parts/sum-141-7961gm25
And lucky me I found my chip burner in the car ... I hadn't been in the car since late Sept/early Oct ... I need to add timing back below 3000RPM, it's a dog below that currently.[This message has been edited by lou_dias (edited 05-10-2013).]
|
|
|
|
Will
|
MAY 10, 11:52 AM
|
|
| quote | Originally posted by lou_dias:
Yes but mine is bored .020" over so it is a true 3.40000000000 ;-)
A stock 3.4/3400 uses a 3.62" bore. I'm at 3.64" and a 3500 LX9 uses a 3.7" bore. If I ever rebuild this block (again) maybe I'll just have it bored to that.
|
|
I didn't think the 3400 block could go that big safely. The non-VVT 3500 uses a 94mm bore, which is nearly .080 over stock for a 3400... that's a pretty aggressive overbore.
OTOH, a .036 overbore for the 3500 gets it to the 305 Chevy bore size and opens up a large number of possibilities for custom pistons.
|
|
|
|
lou_dias
|
MAY 10, 01:49 PM
|
|
| quote | Originally posted by Will:
I didn't think the 3400 block could go that big safely. The non-VVT 3500 uses a 94mm bore, which is nearly .080 over stock for a 3400... that's a pretty aggressive overbore.
OTOH, a .036 overbore for the 3500 gets it to the 305 Chevy bore size and opens up a large number of possibilities for custom pistons. |
|
If the cranks are the same then the walls between the cylinders can't change, correct? Well, I suppose I mean the cylinder spacing within the block. For the 3500 to have thicker inner walls, it would need to be a longer block and different crank. So if the inside of the block is the same, then it seems to me that a 3400 block can be bored pretty far. In reality my next rebuild would only go to .040" over but it still seems possible...
|
|
|
|
carbon
|
MAY 10, 01:55 PM
|
|
The cranks are not the same, what are you talking about? The LX9 cylinders are also positioned slightly different in the block. That was the 3900... sorry...[This message has been edited by carbon (edited 05-10-2013).]
|
|
|
|
lou_dias
|
MAY 10, 02:18 PM
|
|
| quote | Originally posted by carbon:
The cranks are not the same, what are you talking about? The LX9 cylinders are also positioned slightly different in the block. |
|
Well that explains that...or are you confusing the VVT 3500 that is based off the 3900? Or is all 2004+ 3100/3400/3500's a different crank casting all together?
Who sells an under-drive pulley for Fiero engines?[This message has been edited by lou_dias (edited 05-10-2013).]
|
|
|
|
carbon
|
MAY 10, 02:24 PM
|
|
|
|
|
lou_dias
|
MAY 10, 02:30 PM
|
|
Thanks! I'm already using his idler and I converted to the 88 alternator so I'm gonna have to contact him directly for just the belt and pulley!
|
|
|
|
Will
|
MAY 10, 03:36 PM
|
|
| quote | Originally posted by lou_dias:
If the cranks are the same then the walls between the cylinders can't change, correct? Well, I suppose I mean the cylinder spacing within the block. For the 3500 to have thicker inner walls, it would need to be a longer block and different crank. So if the inside of the block is the same, then it seems to me that a 3400 block can be bored pretty far. In reality my next rebuild would only go to .040" over but it still seems possible... |
|
Negative, ghost rider. The V6's use NON-siamesed bores. There's water between the bore walls.
That's what allowed GM to go to 99mm in the VVT 3500 and 3900. The bore spacing did *NOT* change... the bores just moved "downhill" in order to maintain their clearance to the camshaft. For the 99mm blocks, the bore centerlines no longer intersect the crank centerline.
Anyway, just like any other engine, if you bore it too big, the walls get too thin *somewhere* and you risk cracking a bore and letting coolant into your chamber or your oil pan. Either way, it's not favorable.[This message has been edited by Will (edited 05-10-2013).]
|
|
|
|
carbon
|
MAY 13, 09:13 AM
|
|
| quote | Originally posted by Will:
Negative, ghost rider. The V6's use NON-siamesed bores. There's water between the bore walls.
That's what allowed GM to go to 99mm in the VVT 3500 and 3900. The bore spacing did *NOT* change... the bores just moved "downhill" in order to maintain their clearance to the camshaft. For the 99mm blocks, the bore centerlines no longer intersect the crank centerline.
Anyway, just like any other engine, if you bore it too big, the walls get too thin *somewhere* and you risk cracking a bore and letting coolant into your chamber or your oil pan. Either way, it's not favorable.
|
|
But what about reaching the 94mm on the LX9 3500 block with the LA1 3400 block? It's still a huge over bore, but I think that is what he meant. There is no way to reach the specs of the VVT engines with either the LA1 or LX9 block.[This message has been edited by carbon (edited 05-13-2013).]
|
|
|
|