K24a1 block + K20a2 head, all stock... safe redline? - Honda-Tech

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K24a1 block + K20a2 head, all stock... safe redline?

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Old 07-23-2009, 08:14 AM   #1
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Default K24a1 block + K20a2 head, all stock... safe redline?

just wondering how high this combo can rev to safely? ive heard the stock k24 rods dont allow for high reving.
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Old 07-28-2009, 09:24 AM   #2
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

118 views and no replys... bump
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Old 08-10-2009, 09:43 AM   #3
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

Well the head, being k20a2, can obviously take a 8k rpm beating all day. The block, being a k24, can only take 6500 rpm or something, whatever the redline was from the car it came from. So the block is your limiting factor here, so you can only safely rev to 6500 or whatever the redline of the block is.

Notice I said "safely". I consider that not going beyond stock, on stock parts. If you have aftermarket parts in the block, then rev the hell out of it. If you rev the hell out of it on a stock block, you risk an early death of the motor.
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Old 08-10-2009, 05:11 PM   #4
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

i am reving my k24 with 20009 tsx pistons and 2006 tsx rods, k20z3 head with single valve springs to 7800-8k....

i have 8 hours of ROAD RACE miles on my engine with tuning and track time at this point. i checked the bearings and oil pan after 4 hours....so far everything looks good....

I would check after every weekend but am not a fan of torqueing and retorqueing stock rod bolts!!!

chad
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Old 08-10-2009, 05:59 PM   #5
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

The stock TSX k24a4 block redlines at 7100 RPM, so essentially if you want a stock bottom end for your hybrid that is the setup to go with. Or you could simply swap the TSX internals into the accord/crv block as chad did to achieve a higher redline safely.

BTW chad I just saw your numbers and they are impressive for all OEM parts. Good work.
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Old 08-31-2009, 06:49 AM   #6
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

are tsx rods really that different from the other k24 rods? Most of the time the stock rev-limit is set by the limitations of the head/valvetrain. I would expect most factory honda bottom ends to be able to take at least 1,500RPM over the stock rev limit, and this has been done many times with other honda motors. Why would the K24 be different?
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Old 09-01-2009, 09:04 AM   #7
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

I revved a K24A1/K20A2 to 7500.

Only took about 6 months for it to break a rod... it was a circuit car which was raced every weekend and saw a few 10,000rpm miss shifts from various drivers.

It was an awesome and fairly inexpensive little setup. I would say 7000-7500 on a bone stock CRV block is about it's limit.
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Old 09-06-2009, 02:00 PM   #8
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

change oil pumps, pan and baffles and you can revv to 9 all day.
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Old 09-08-2009, 09:30 AM   #9
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

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Originally Posted by ekslammed View Post
change oil pumps, pan and baffles and you can revv to 9 all day.
Rev a K24 with stock internals to 9k and see what happens. I promise, you'll have the rods laying on the ground.
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Old 09-10-2009, 07:01 AM   #10
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

My k24a1 block with a k20a2 oil pump and k20a2 head, I rev to 8000 rpm on a daily basis. On the dyno I rev'd it up to 9000 rpm so I can see the power band.

Made 450 whp on 12 psi boost. And made 240 whp NA.

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Old 09-10-2009, 07:39 AM   #11
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

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My k24a1 block with a k20a2 oil pump and k20a2 head, I rev to 8000 rpm on a daily basis. On the dyno I rev'd it up to 9000 rpm so I can see the power band.

Made 450 whp on 12 psi boost. And made 240 whp NA.

Stefan
Stefan,

How long has that setup been going? How often is it raced?

Stock cams?
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Old 09-15-2009, 09:26 AM   #12
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

so what do you acctuly need to do this swap appart from the k20a2 head, better oil pump and better oil pan......? looking forward to do this swap .....advice is apreciated
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Old 04-08-2013, 08:03 AM   #13
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

what happened with this post??

which are the best internals for k24a1?

are the k24/k20 frankies safelly at 8500 rpms, not like the B series that are so limited to 7000-7500 rpms
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Old 04-08-2013, 07:08 PM   #14
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Default Re: K24a1 block + K20a2 head, all stock... safe redline?

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Originally Posted by fugazzyef View Post
what happened with this post??

which are the best internals for k24a1?

are the k24/k20 frankies safelly at 8500 rpms, not like the B series that are so limited to 7000-7500 rpms
stock bottom end k24 franks should be kept at their original rev limits, much the same as a stock bottom end lsvtec. neither was designed to rev to 8k+.
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