k24 RPM limit

**Chris_F** · 30-05-2009 06:24 PM

I know 7600rpm seams to be a popular rev limit for a stock k24, but I want some input from those who have had experience with a tuned K24 engine. Please vote for your preference in the poll and leave a comment explaining why...

This is for a k24 accord euro engine with all the basic I/H/E modifcations.

Thanks!

**ZeForce** · 30-05-2009 07:54 PM

I havent had much experience with K24's in particular, but you are talking about 100rpm here sounds like you're splitting hairs

**chargeR** · 30-05-2009 08:06 PM

K24s vary also do they not? Are you talking about the Euro K24?

**Chris_F** · 30-05-2009 08:20 PM

Originally Posted by ZeForce

I havent had much experience with K24's in particular, but you are talking about 100rpm here sounds like you're splitting hairs

I'm splitting hairs for sure... but the k24 has high piston speeds, so I'm being extra careful.

Originally Posted by chargeR

K24s vary also do they not? Are you talking about the Euro K24?

Yep, k24 Euro engine. Forgot to mention that.

**EG5** · 30-05-2009 11:00 PM

7800 RPM here when I used to had stock internals k24a3.

We raised the rev limit now to 8300 rpm as I got Buddyclub N+ cams , valve springs , retainers.

**Chris_F** · 30-05-2009 11:12 PM

Originally Posted by EG5

7800 RPM here when I used to had stock internals k24a3.

We raised the rev limit now to 8300 rpm as I got Buddyclub N+ cams , valve springs , retainers.

so no problems at 78000rpm? How long did you have the car with that RPM limit for?

**fatboyz39** · 30-05-2009 11:26 PM

Depends what model Euro motor you have. We usually turned it to safe 7400rpm (ECU cutoff). Completely stock K24 motor unopen rocker cover. From factory there about 7100-7200rpm. Im not a K-series expert. Mayb Drhonda will add his 2cents.

I believe Yonas had type R valve springs with the 7800rpm limit.

**EG5** · 30-05-2009 11:33 PM

Originally Posted by fatboyz39

Depends what model Euro motor you have. We usually turned it to safe 7400rpm (ECU cutoff). Completely stock K24 motor unopen rocker cover. From factory there about 7100-7200rpm. Im not a K-series expert. Mayb Drhonda will add his 2cents.

I believe Yonas had type R valve springs with the 7800rpm limit.

Single valve springs k24a3 when it ran 11.82 down the 1/4 mile.
Not recomended to rev it to 7800 rpm on stock internal k24a3.
The only thing from k20a2 was crank pulley and 50 degree VTC
7400 - 7600 rpm will be the best rev limit , As power just started to drop on that RPM.

Had my K swap since July 07 , still healthy till today

**Chris_F** · 30-05-2009 11:45 PM

thanks for the input so far guys.

At the moment I'm leaning towards a soft limit at 7500 with hard limit at 7600

edit: decided to go for 7600 soft cut and 7700 hard cut. That way it will be tuned to those RPM and I can always change the rev limiter myself at a later date

Any other opinions on this?

**EG5** · 02-06-2009 10:57 AM

Originally Posted by Chris_F

thanks for the input so far guys.

At the moment I'm leaning towards a soft limit at 7500 with hard limit at 7600

edit: decided to go for 7600 soft cut and 7700 hard cut. That way it will be tuned to those RPM and I can always change the rev limiter myself at a later date

Any other opinions on this?

Should be no problems at all.

**fatboyz39** · 02-06-2009 04:58 PM

No point reving higher if power drops off @ 7000rpm

**Chris_F** · 04-06-2009 11:56 AM

Originally Posted by EG5

Should be no problems at all.

Ok, thanks Yonas

Originally Posted by fatboyz39

No point reving higher if power drops off @ 7000rpm

The reason for the higher rev-limit is also to do with the gear ratios of the k24a3... shifting from 1-2 with a 7000rpm limit would see you drop out of the power band and in 2nd gear you'd only be at about 4200rpm.

You can see what I mean when you look at the ratios:

Ratio 1: 3.533
Ratio 2: 1.880
Ratio 3: 1.354
Ratio 4: 1.027
Ratio 5: 0.825
Ratio 6: 0.659
Final drive ratio: 4.388