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Thread: N1 pistons at 10k rpm

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Posts: 21-30 of 49
2011-01-29 02:12:09
#21
Piston speeds on the SR at 8000rpm are getting pretty high. 10000rpm is about 5700fpm. or 1000fpm more than 8500rpm. I wonder how well a turbo vvl handles those rpm. I rev out to 8800rpm now, which is 4800fpm roughly. That's gotta be a ton of stress, considering my pauter rods can't be light.
2011-01-29 05:17:38
#22
Originally Posted by Coheed
Piston speeds on the SR at 8000rpm are getting pretty high. 10000rpm is about 5700fpm. or 1000fpm more than 8500rpm. I wonder how well a turbo vvl handles those rpm. I rev out to 8800rpm now, which is 4800fpm roughly. That's gotta be a ton of stress, considering my pauter rods can't be light.


Slightest bit of detonation will see the end of your bearings!

The problem is there are not many quality bearings availabe on the market for our SR's.

The acl race series stuff has 3 layers of material and the white babbot layer is easily damaged exposing copper which will pick up and heat up easily. Before you know it copper will ball up and spin your bearing and bend your crank.

To the O.P spinning to 10k on a square engine like the sr is not reccommended. Im not sure if you have heard a VE at sustained 9k, it doesnt sound or feel right, the harmonics just dont like to be there for too long!
2011-01-29 13:22:01
#23
For drag racing 9-10k is fine on a ve. The car won't spend prolonged high rpms. I have 20+ passes reving out to 9500 on a stock 2.0 bottom. I can also say the car has seen a lot of street work as well haha.

I would imagine a road or auto x car would be more likely to have issues due to being high rpms for longer times and all the down shifting etc that we don't see in drag racing.

My recommendation build it do it and let us know how it works so we have a definitive answer.
2011-01-29 16:54:56
#24
Exactly, iv run 9700 for a full season aswell. And its true, drag motors usually push some stupid high pistons speeds, as long as the pistons are fairly light so the pins don't get riped out..

Btw mrspecv, what were u running at the track w ur old 2.0?
2011-01-29 17:54:27
#25
Originally Posted by Autech
To the O.P spinning to 10k on a square engine like the sr is not reccommended. Im not sure if you have heard a VE at sustained 9k, it doesnt sound or feel right, the harmonics just dont like to be there for too long!


this isnt what i want to hear lol

surely thats because the VE has a 4CW. Im going for 8cw, balanced, forged rods and pistons ... obviously uprated bearings, and bolts (head and crank)

i really had my heart set on this .... but to be honest, not even the F3 car in japan revs out to beyond 8k

Steve
2011-01-29 18:08:08
#26
I was holding mine at nearly 8500 all round Gerrards, at Mallory and it did sound abit funky! Not something I would do week in week out. Comparing it to the B16b which just eats 9krpm all day on the track.
2011-01-29 20:14:39
#27
Originally Posted by steve55

but to be honest, not even the F3 car in japan revs out to beyond 8k


Because they have rules, restrictor on intake, etc.. but there is no need to rev that high.. right setup can make same power/torque at lower rpm.
2011-01-29 20:18:16
#28
Exactly, if you just want to rev high you could make a killer set up that would rev to the moon. Sleeved block and sr16 crank. 90x68mm
2011-01-29 20:23:12
#29
Originally Posted by jagy
Because they have rules, restrictor on intake, etc.. but there is no need to rev that high.. right setup can make same power/torque at lower rpm.


yeah, i work with the toyota powered english/spanish versions, even with the restrictions they sound immense

Originally Posted by cory
Exactly, if you just want to rev high you could make a killer set up that would rev to the moon. Sleeved block and sr16 crank. 90x68mm


thats what i was thinking at the start, but wouldnt know how to get started
I would have to get my block and head shipped to mazworxs, too expensive lol

Steve
2011-01-29 20:45:20
#30
You wouldn't need to send your head off. You could also just go stock sleeved 88mm bore and sr16 crank.. that would be sick and pretty affordable aswell. But if your building a circut car I would try and aim the peak revs to around 8-8.5k.

A drag situation is different. We can hit 9.5-10k because its only for 10-11 seconds at a time...
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