N00b question... How fast could this spin...and work?

[donk_316]

Say you have a 91-92mm 60 V6 block.

A forged 2.8 Crank.

Good quality H beam 6" rods.

High quality Forged Pistons

Dry sump oiling system...

**Assume the heads can flow enough to support any RPM for this discussion**

Do you think this could hit 10,000 RPM reliably?

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[SappySE107]

Maybe balanced and ARP bolts, and the rods/pistons are light weight. Hard to tell, as its all theory and well...guessing. I think 8k would be a no brainer. 9k would be doing good. 10k, unknown. Looking at what GM has done to the TT 3.6 VVT to get it over 10k RPM...maybe?

[donk_316]

Yeah balanced would be a given and same with the high quality fasteners...

Its more...like you said guessing...I guess someone has got to build it and see what happens!

[SappySE107]

Pretty much Would be good in a fiero at least if it works out. However, you gotta make sure the top end is designed for it as well. And the cam.

[betterthanyou]

I dont think it would have a problem. A small block can do it with a longer stroke and heavier components. The slow piston speed of the 2.8L crank would be an advantage.

Do the above mentioned procedure and slap a rev kit on the lifters. I bet it would do it no sweat.

[eliteweapons]

Why do you need to spin it to 10k? Most of the simulations I havr run on the 3100 max out at around 7000 with major modding. The 2.8 show peak hp at 6000 with mods. I don't know how you could even get a head to flow that the geometry just isn't there to support it.This is just a base line of mods but I don't really see a need for 10k. The engine can't support the cfm above the 7000 range.

[eliteweapons]

Ok stupid me forgot to adjust the head flows. If you run a 4 valve per cylinder head to meet the flow demand. it peaks at 5850 with 291 hp ( remember this is a hurry up throw it together sim). At 1000 rpm 224 hp. Thats normaly aspirated with a 550 lift and max lifter acceleration. two 1.422 inch intake valves and 2 1.242 inch exhaust.

[v6h.o.]

If you ask any machinist who does race engines he will tell you:

"An engine Ballanced at 100rpm is still balanced at 10,000 rpm, The limiting factor is the Valvetrain, That is what will determine RPM rev Limit"

It could be done. Anything can be done. $$$ is the factor here.

[Shaun41178]

I talked to a guy tonight on teh phone that used to build 60 degree race motors and knows the infamous Potter dude.

He spun his motors to 7800. Potter didnt' go higher then 8600. That prob tells you something.

[SappySE107]

Would be nice if someone like that would join our forum or send us some useful information. We appreciate what you have told us though