Is there any major dif. between these two. I am talking just the blocks. As in would a K20a2 block be a better choice in sleeving over the A3? The A3 are so cheap to come by so I just wanted to know.
ventuli
so the only difference is the crank cheetah?
i know the blocks are pretty much identical... the a3 even has the boss for squirters casted but just not drilled.
i know the blocks are pretty much identical... the a3 even has the boss for squirters casted but just not drilled.
Are the internals the same...Pistons/rods? and it's the crank that gives the different compression? or no?
I'm kinda thinking the A/a2/a3 all have different rod/piston combo's. Do the a2/A have the same crank?
I'm kinda thinking the A/a2/a3 all have different rod/piston combo's. Do the a2/A have the same crank?
so we can gut an A2 block and put all the internals in an A3 blocks with no problems, everything will bolt in with the addition of drilling out the oil squirters?
Correct. You also have to tap 2 holes on the back of the block for the coolant lines for the oil cooler.
Not much involved in the conversion. Jut need a competent machine shop to drill and tap a few holes. As for parts ... www.acuraparts247.com .
Not to mention that if you go with forged pistons, you can leave the oil squirters off (as long as they're not fed oil, if they are, just pinch them off) and increase the oil pressure in the rest of the engine since forged pistons don't need the squirters. Sounds like if you have an k20a2, and need a new block for F/I if you damaged your old one or want to do a new build, doing a k20a3 block with the oil cooler holes added with your original a2 crank is the way to go. Cheap, and lots around. 
so since when are the rod journals different sizes? granted i looked for the info from rod manufacturers who say a2/a3s use the same application. i believe i ve even asked edo and nikos about this information, and it was just word of mouth standpoint unless somebody has a helms laying around to verify.
so, after reading all this - the cranks are the same between the a2 and a3.
stroke - same
rod journal - same
mains - same
stroke - same
rod journal - same
mains - same
heres something i found on hondanews.com
Engine Block/Crankshaft
The RSX engine features a compact aluminum block with cast-in iron liners- a design known for its light weight, high rigidity, and excellent durability. The block has a one-piece aluminum crankshaft carrier, which has ferrous-carbon inserts in the bearing caps for additional strength. The Type-S version also incorporates a stiff, cast-aluminum oil pan. The crankshaft is a highly rigid, forged-steel design that uses a special micro-polished surface finish for reduced friction and increased durability.
In addition, the Type-S engine uses high-strength connecting rods and crankshaft as well as high-compression cast-aluminum pistons for increased resistance to wear
The transversely mounted engine block with front- mounted intake manifold, positions the exhaust manifold closer to the catalyst for improved light-off and reduced emissions at start-up.
Dual-Stage Intake Manifold (RSX Model)
Now it doesnt say that the jounals are different sizes but it does say it uses a higher strength crankshaft. Now all we need is specs!!!
Engine Block/Crankshaft
The RSX engine features a compact aluminum block with cast-in iron liners- a design known for its light weight, high rigidity, and excellent durability. The block has a one-piece aluminum crankshaft carrier, which has ferrous-carbon inserts in the bearing caps for additional strength. The Type-S version also incorporates a stiff, cast-aluminum oil pan. The crankshaft is a highly rigid, forged-steel design that uses a special micro-polished surface finish for reduced friction and increased durability.
In addition, the Type-S engine uses high-strength connecting rods and crankshaft as well as high-compression cast-aluminum pistons for increased resistance to wear
The transversely mounted engine block with front- mounted intake manifold, positions the exhaust manifold closer to the catalyst for improved light-off and reduced emissions at start-up.
Dual-Stage Intake Manifold (RSX Model)
Now it doesnt say that the jounals are different sizes but it does say it uses a higher strength crankshaft. Now all we need is specs!!!
So from the sound of things the a2 and the a3 are the same except the cranks.....
So does any one know about the k24a4 vs. k20a2?? Are the cranks in the k24a4 engine larger than the k20a2 or are they the same. I heard somewere that the rod journals on the k24a4 are wider than the k20a2 but cant seem to find any materials to back this up any clues anyone? Thanks for your time in advance.
So does any one know about the k24a4 vs. k20a2?? Are the cranks in the k24a4 engine larger than the k20a2 or are they the same. I heard somewere that the rod journals on the k24a4 are wider than the k20a2 but cant seem to find any materials to back this up any clues anyone? Thanks for your time in advance.
so, today, i put an a2 crank beside an a3 crank and checked the differences.
stroke - same
journals - same - that's why the a2 rods and a3 rods can be interchanged.
difference: counterweights. the a2 crank has more than a3. i'm guessing because the a3 uses balance shafts.
this is from a glance... if anyone finds anymore info or can correct me, please do so.
stroke - same
journals - same - that's why the a2 rods and a3 rods can be interchanged.
difference: counterweights. the a2 crank has more than a3. i'm guessing because the a3 uses balance shafts.
this is from a glance... if anyone finds anymore info or can correct me, please do so.
that's interesting as crower advertises and swears that they're the same rods for both applications. i'll measure them and post my findings.
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