K24 All-Motor with APIDAdromics valve timing
10-25-2007, 04:51 PM
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K24 All-Motor with APIDAdromics valve timing
I am starting on an APIDAdromics conversion of a K24-A2 engine. Part of this conversion includes Darton sleeves bored to 90mm and a shortening of the stroke to 90mm. This involves using special rods but increases the rod ratio to 1.74:1 from 1.54:1. It also changes the displacement from 2.4 liters to 2.2 liters and makes the engine "square" in that the bore equals the stroke.
Since the Patented APIDAdromics system eliminates any VTEC parts, the difference in VTEC between the K20 and the K24 should be moot. In the course of looking at aftermarket parts I have found that suppliers are adamant about the fact that their parts are for K24 blocks with K20 heads. Nobody wants to tell me why ! As far as I can tell, the 2 heads are the same and only the VTEC is different.
After reading the article in Sport Compact Car on making the hybrid k24/K20, I understand that I can remove the balance shafts to reduce weight and friction even further.
IF ANYONE KNOWS WHY THE HYBRID PARTS WON'T WORK, PLEASE TELL ME !!!
Thank you,
APIDAdromics
Since the Patented APIDAdromics system eliminates any VTEC parts, the difference in VTEC between the K20 and the K24 should be moot. In the course of looking at aftermarket parts I have found that suppliers are adamant about the fact that their parts are for K24 blocks with K20 heads. Nobody wants to tell me why ! As far as I can tell, the 2 heads are the same and only the VTEC is different.
After reading the article in Sport Compact Car on making the hybrid k24/K20, I understand that I can remove the balance shafts to reduce weight and friction even further.
IF ANYONE KNOWS WHY THE HYBRID PARTS WON'T WORK, PLEASE TELL ME !!!
Thank you,
APIDAdromics
10-25-2007, 07:00 PM
#2
Re: K24 All-Motor with APIDAdromics valve timing (APIDAdromics)
Can you explain better what you are trying to do and why?
Even though I do know know what a Patented APIDAdromics system is, I would expect that you guys know what you are doing before attempting to eliminate vtc and vtec.
Most piston companies refer to the k24/k20 combo due tothe increase stroke from 86mm to 99mm.. As you probably know, a piston that yields 10:1 compression on a k20 block, willnot yield the same compression on a k24 block with different stroke. Also stock bore on a stock k20 is 86mm and on a k24 , it is 87mm
There are 2 main types on k24a heads. The tsx k24a2 head that has lost motion springs and is basically a vtec head, and the other k24a heads that are basically non vtec heads.
The tsx head has weaker internals including smaller seats. There are a lot more differences as far as flow and the way the water is routed.
Even though I do know know what a Patented APIDAdromics system is, I would expect that you guys know what you are doing before attempting to eliminate vtc and vtec.
Most piston companies refer to the k24/k20 combo due tothe increase stroke from 86mm to 99mm.. As you probably know, a piston that yields 10:1 compression on a k20 block, willnot yield the same compression on a k24 block with different stroke. Also stock bore on a stock k20 is 86mm and on a k24 , it is 87mm
There are 2 main types on k24a heads. The tsx k24a2 head that has lost motion springs and is basically a vtec head, and the other k24a heads that are basically non vtec heads.
The tsx head has weaker internals including smaller seats. There are a lot more differences as far as flow and the way the water is routed.
10-25-2007, 07:23 PM
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The balance shafts are in the oil pump. Its always a wise choice to go to a k20a2 oil pump. The newer the model of the pump the less likely the pump will cause cavitation. There is a difference in the combustion chambers. The chambers are bigger in the k20a2. Why not pick up a k20a2 head.
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