K20A3 with A2 internals for boost - K20A.org .:. The K Series Source . Honda / Acura K20a k24a Engine Forum
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Old 06-25-2008, 06:33 PM   #1
9JDMCRX0
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Default K20A3 with A2 internals for boost

I'm new to building k-series motors and i'm trying to get input on what interchanges with what. Here is what i'm trying to do. also any help or suggestions would be greatly appreciated.
I have the K20A3 swap.
Scrapped the head! using the tranny and the bare block
I'm planning on sleeving the block(golden Eagle) and using a good set of rods and a 9:1 piston(for turbo setup).
I'm wantingto know if the A2 crank,oil pump and pan is a direct fitment to the A3 block? I'm sure people are just wondering why i didn't go the A2 route but i got a good deal on the swap so i took it. I hear that the A3 block doesn't have the oil squirters for the pistons so this shouldn't hurt since i dont really need them with a forged piston. I'm just trying to find out what will be the better route to go before i spend the cash in getting the A3 block sleeved then not being able to put it to good use.
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Old 06-26-2008, 12:06 PM   #2
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Default Re: K20A3 with A2 internals for boost

a2 and a3 blocks are identical. Only difference is the a2 has a port machined in the back to handle the factory oil cooler. So crank, rods, pistons, oil pump, etc. are all interchangeable.
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Old 06-26-2008, 01:45 PM   #3
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Default Re: K20A3 with A2 internals for boost

Yes they will work. As mentioned above. I had a k20a3 block with 06 rsx-s crank, eagle k20 rods, and wiseco 9:1. Made over 500whp to the wheels.
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Old 06-26-2008, 03:20 PM   #4
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Default Re: K20A3 with A2 internals for boost

This is good news for the urban green crx! Does anyone know about how much i will end up spending for golden eagle to sleeve the block? i know i have to send the pistons with the bare block so that the can get everything honed to the exact. I'm just trying to figure out what justthe high boost A3 setup is going to cost
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Old 06-26-2008, 03:21 PM   #5
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Default Re: K20A3 with A2 internals for boost

vtecspeed did you use your A3 pump and pan or did you swap out?
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Old 06-26-2008, 06:56 PM   #6
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Default Re: K20A3 with A2 internals for boost

what a3 pump are you referring to? The k20a3 from the rsx uses the same pump as the k20a2. Its the k20a3 from the ep3/si that has the balance shafts.
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Old 06-26-2008, 08:17 PM   #7
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Default Re: K20A3 with A2 internals for boost

Quote:
Originally Posted by 9JDMCRX0 View Post
vtecspeed did you use your A3 pump and pan or did you swap out?
I used the k20a2 pump and I want to say ge charges 900
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Old 06-27-2008, 08:04 AM   #8
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Default Re: K20A3 with A2 internals for boost

see i'm not sure what a3 i have because the intake manifold isn't composite so i guess it would be out of the SI?
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Old 06-27-2008, 10:59 AM   #9
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Default Re: K20A3 with A2 internals for boost

then yeah, sounds like you have the si/ep3 k20a3.
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Old 06-27-2008, 12:22 PM   #10
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Default Re: K20A3 with A2 internals for boost

This is from an a2 or rsx A3

This is from an ep3 a3 or K24
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Old 06-27-2008, 05:18 PM   #11
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Default Re: K20A3 with A2 internals for boost

as long as i get everything from the a2 i should be able to convert it though right? i'vee just heard so much different stuff about a3 parts that i want to change everything over to A2. almost need an A2 parts block. also need the upper half too though.
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Old 07-09-2008, 06:58 PM   #12
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Default Re: K20A3 with A2 internals for boost

i think i'm going to go with the s2000 pump setup. how much lower will the k24 pan set than the k20?
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Old 07-10-2008, 09:03 AM   #13
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Default Re: K20A3 with A2 internals for boost

I was under the impression that the k24 pan was shallower than the k20 pan. If you don't plan on constantly revving above 8500, then I would advise against the s2k pump. You also run into problems with getting a baffled pan if you want to do roadcourse events.
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Old 07-10-2008, 09:23 AM   #14
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Default Re: K20A3 with A2 internals for boost

Maybe it is shallower than the K20. Only straight line for me though. not to much on the road racing.
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Old 07-10-2008, 09:27 AM   #15
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Default Re: K20A3 with A2 internals for boost

With a good tune and a good rotating assembly what boost levels will it be safe to take a stock (unsleeved) block to? Just trying to figure out where i want to spend the money for now. I dont mind building a sleeved block later on down the road but the prices are so high.
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