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Old 11-26-2005, 08:33 AM   #1
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Building up bottom end...

Have a few pretty standard questions for ya'll that I'm a little in the dark about...

I'm looking into building up the bottom end on my motor for 1) more boost and 2) possibly a greater rev range to take advantage of my cams (crane 3's). I'm looking to get in the 8-8500 rpm range due to the cams I have in there, and the fact that the blower looks to be holding up nice and steady from 4500 to redline...no doubt more to be had.

Now, I know I'll have to get some sort of custom clutch that won't explode at stress levels like that (sintered something or some crap like that). But, in regards to the pistons, rods, crank, etc...what would you all recommend doing?

Pistons - recommendations? We know higher compression is an enemy when it comes to turbo charging....but what about blowers? Would it be advisable to up the compression a notch or leave as is?

Rods - no brainer

Crank - psi, not worried about..but will the stock one hold up to the stresses of high revs?

Worst case I'll switch out cams for some slightly less aggressive ones to bring up the low-midrange a bit, and try to find a smaller pulley to bump the boost a bit....in which case, the compression question remains...little higher? or a little lower?


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Old 11-26-2005, 09:19 AM   #2
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Its more TQ that sets the stage for octane and compression , The TQ = Cyl load = higher chance of deto

Turning this engine to 8000 is a crazy idea and 8500 is insane , instead of making the RPM match the cams how about making the cams match what you are trying to do

If your form of FI does not hit its mark with in a reasonable amount of RPM (6500 to7000) than maybe you need to look at that

change the blower unit and pulley go to a set of FI cams not cams that are ment for high RPM all out racing

All things need to work togather the blower needs to be able to reach you goal with in a good RPM range

The cams need to work with in that same RPM range but with out giving up bottom end

A good header is VERY important as well as i would go to some good Exh 3 inch or at least 2.5

Try to work on the TQ the HP will take care of itself

I would do 9.2 to 9.6 compression , stay away from large ported heads , look at the crower FI cams and do some home work to see what COMBINATION is going to work best for your goal

I have built 5 engines this year alone that have broke oil pumps from high RPM

Tom
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Old 11-26-2005, 10:44 AM   #3
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Perfect...thank you for the insight Tom.
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Old 11-26-2005, 11:42 AM   #4
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Quote:
Originally posted by 1turbofocus
I have built 5 engines this year alone that have broke oil pumps from high RPM

Tom
speaking of broken oil pumps...how's that billet pump coming along that you've been working on?
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Old 11-26-2005, 12:24 PM   #5
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Still in the works

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Old 11-26-2005, 04:41 PM   #6
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Also interested in a pump alternative. I'm on oem pump #3. keep us posted



g
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Old 11-27-2005, 09:25 AM   #7
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how high of rpm does an oil pump last
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Old 11-27-2005, 10:11 AM   #8
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7600ish
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Old 11-28-2005, 09:10 AM   #9
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Is that a problem for the svt also? I have a friend that has one and he has is rev limit at 7500 just wondering if he is getting close to the problem. It hasnt yet but maybe he sould back off some? Kinda would suck if he backed off that car loves the rmp's.
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Old 11-28-2005, 02:29 PM   #10
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i'd assume the pump wouldn't be a problem if you just dont rev that high?
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