Safe max rpm/rev limiter

[Chris_Murder]

I'm almost done cleaning up my 93 engine for my motorswap, but durring my paperwork for my tune from sct I hit a road block. What is it safe to spin these engines up to? It's a mostly stock 93 long block with new gaskets and seals with aftermarket cams.

Thanks all!

-Chris_Murder

 

[slowmkviii]

Did you upgrade valve springs

 

[evf4720]

i would also like to know this. only on a stock engine. i love the sound of a screaming v8 but it just doesnt sound "healthy" to me

 

[Chris_Murder]

Did you upgrade valve springs

No, I went fairly conservative on the lift and was told I didn't need to upgrade the springs. But I can if needed.

Whats safe on stock springs/Stock bottom end vs aftermarket beehives/stock bottom end?

 

[slowmkviii]

Gen 2 had the beehive springs you want atleast that
with them the motor should be fine to 7200 IMO
But a stock torque converter will not be good that high
I have heard of people cracking stock Gen 1 springs

 

[slowmkviii]

And your cam maker should tell you your best rpm range

 

[MediumD]

On 93 springs, personally 6500 is all I would do. I agree, talk to the cam grinder and they'll tell you where your shift points should be... or just do it "right" and have it dyno tuned.

 

[Chris_Murder]

The 93 mark it came out of was shifting at 7000 with no problems the springs may have been upgraded as well I honestly don't know. I just wanted to be sure that the bottom end would hold up to that kind of abuse without forged internals.

 

[MediumD]

Bottom end probably not an issue until closer to to 7200-7400.

 

[Chris_Murder]

whats the max safe rpm for the mark VIII torque converter

 

[Chris_Murder]

Anyone?

 

[Staffamerica74]

i think 6400 for stock.

 

[slowmkviii]

^^^ +1
I think he is right

 

[MediumD]

I wouldn't spin a stock converter past 6800 or so..

 

[chicken]

you puttin the mark motor in the bird in your avatar or back into the 93?
if into the bird read this: http://www.lincolnvscadillac.com/showthread.php?t=25280

 

[XLRVIII]

I wouldn't spin a stock converter past 6800 or so..

DING DING DING

we have a winner folks!
(raises MediumD's hand up high)

the motor will survive at an RPM that is higher than the TC.

6800 is a little on the highside IMHO.

6300-6400 is "rolling the dice" on a stock torque converter

 

[XLRVIII]

Anyone?

talk to JLangton

the "true and correct" upper limit is right 6K when the converter begins to balloon.
ballooning converters is bad.

 

[chicken]

ballooning converters is bad.

but i like balloons

 

[XLRVIII]

but i like balloons

look a butterfly
(jumps and kicks)