How many RPM’s is too many?

[BulldogBronco]

I have a guy helping me with remote Holley Sniper EFI tuning. So far the results have been really good and I’m happy with it. We’re to the point of tuning wide open throttle and he wants to me to do data logs up to 5,000 - 5500 RPM’s so he can tune the top end fuel tables. I never really push my Bronco like that so I’m a little weary and want to see if you guys think it’s safe in general to go to the 5K+ range. Rebuilt 302 with a mild cam. Also can that do any damage to the transmission or any other components like rear end, etc?

 

[doran4x]

If the engine is solid a small block will spin to 6500 - 7000. I have run mine at 4000 with bursts to 5500-6000 in sand washes.


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[Timmy390]

I'm running a 95 Stang ECM and it shuts down at 6k.

Tim

 

[Broncobowsher]

A good engine can rev and survive. But why? Just take a the data log for as high as YOU are willing to rev the engine. Add a few hundred RPM and set the rev limiter. No worry about reving it too much.

No, you will not hurt things like transmission

 

[jckkys]

The stock cam and induction were topped out at 4500 RPM. Yours may rev higher, but why? I navigate dry sand washes well without ever winding up the engine.

 

[68ford]

Taking it to 5500 won't hurt a thing ;D

https://www.instagram.com/p/BPjb_WtAa7j/?igshid=1fxiug4qqnbfi

 

[BulldogBronco]

Taking it to 5500 won't hurt a thing ;D

https://www.instagram.com/p/BPjb_WtAa7j/?igshid=1fxiug4qqnbfi

Ha, that’s awesome, thanks for all the replies

 

[spap]

Is it balanced, they will rev but unless you have a crazy cam your not making any power up there 5000 is a good point, you can always run it higher but depends on the rebuild and who did it

 

[Broncobowsher]

And were the valve springs upgraded when the cam was put in? Valve float can really tear up a top end. Bottom end is generally good so long as the oiling system is up to snuff.

 

[chuck1022]

I have a stock 77, 29 inch tires, 3.50 gears.....C4 tranny. when I am on the freeway doing 62 MPH, it sounds like I am turning 8100rpm.......;D

 

[bbaltered]

I have a stock 77, 29 inch tires, 3.50 gears.....C4 tranny. when I am on the freeway doing 62 MPH, it sounds like I am turning 8100rpm.......;D

You need to shift out of first gear!

 

[charlie6976]

'How many RPMs is to many?' - When the engine relocates itself in pieces.

 

[kylakekevin]

Mine likes 6 grand a lot!

 

[bmc69]

And were the valve springs upgraded when the cam was put in? Valve float can really tear up a top end. Bottom end is generally good so long as the oiling system is up to snuff.

This ^. The little 302 in my '72 EB race truck didn't make peak power until 7300 and routinely saw over 9000 during a race. The bottom end was nothing special...race balanced, good pistons, rods polished and peened, Mex block well prepared, some oiling system mods. The top end however...whole different story. 5500 is a typically very safe upper limit without significant mods to the top end.

 

[spap]

When the engine relocates itself in pieces. Haaaaa
Till it blows. Haa

 

[WheelHorse]

You need a dyno to see where it falls off.

If you have stock heads she may fall off right at 5000 like falling off a ladder.

 

[Slednut10]

I have a stock 77, 29 inch tires, 3.50 gears.....C4 tranny. when I am on the freeway doing 62 MPH, it sounds like I am turning 8100rpm.......;D

That's your mechanical fan making all that noise

 

[blubuckaroo]

Unless you're using solid lifters, I wouldn't worry about too much RPM. Hydraulics usually stop at about 5500.