K24 crank in a H22A4?

[bagoon316]

i am using cisco's, but i just used zeal and i got 8.6, so i guess cisco's is off somewhere in its calculations. my bad on that.

here is how i find in/out the hole...

you divide stroke in half...thats 49.5
30.5mm in comp
138mm rods

is 218. ur in the hole by 1.5mm

[quickangel93]

What CC do you have the two different H23 pistons listed at? I have them listed as follows
H23A1 = -10.5cc dish top piston and
H23A (DOHC VTEC JDM Accord SiR) = 0.00cc or flat top piston.

8.6:1 for the H23A1 and 9.8:1 for the H23A

They are two different engines/pistons just like the JDM H22A and USDM H22A1 have two different compression ratios.



B18 rods will need to be machined as the BE width is too thick. And they are also 1mm to short.. you need 139mm rods to fill the 219.5 H22 deck height. or 31.5mm Compression height pistons

i am using cisco's, but i just used zeal and i got 8.6, so i guess cisco's is off somewhere in its calculations. my bad on that.

here is how i find in/out the hole...

you divide stroke in half...thats 49.5
30.5mm in comp
138mm rods

is 218. ur in the hole by 1.5mm

i asked my dad that and he said you could have 1-2mm clearance. hes been around cars, trucks, diesels, anything with a motor for over 25 years. he knows his shit.

plus i dont know how you guys are getting 8.6. im using this calcualtor and im getting 9.8cr and still good to go. piston to deck clearance .057 in.

http://www.zealautowerks.com/hfseries.html

and even if its that big of a deal, we could always mill the block 1.5mm.

[quickangel93]

now lets try

f22a pistons
f22a rods
k24 crank.

im coming up with 10.1 cr.

[GhostAccord]

Man your just grasping at straws now. Would you stop using an online compression calculator and think about what your doing here.

An F22 piston (85mm diameter) is 2mm to small for an H22 block (87mm bore) Unless 1-2mm piston to wall clearance is OK too.

Now as for your 1-2mm piston to deck height clearance Ask your dad what that will do to your compression?

[quickangel93]

Man your just grasping at straws now. Would you stop using an online compression calculator and think about what your doing here.

An F22 piston (85mm diameter) is 2mm to small for an H22 block (87mm bore) Unless 1-2mm piston to wall clearance is OK too.

Now as for your 1-2mm piston to deck height clearance Ask your dad what that will do to your compression?

relax

i fogot it was 85mm.

as for piston to deck height, i could always mill it. taking away that 1.5mm.

he told me that was done before and the car still ran fine.

[GhostAccord]

OK IC, what your saying now. And yes you will have to mill it. Be careful that 1.5mm isn't too much for the block and head. Yes the old push rod engines you could mill the hell out of but there is a bit more to an H22 OHC head. The tolerances are a bit tighter. And you will be getting into timing belt length issues if you knock 1.5mm between the head and block.

[trah]

Would you stop using an online compression calculator and think about what your doing here.

agreed do your math manually!

[quickangel93]

agreed do your math manually!

I passed math with a d, so that's going to be hard

[bagoon316]

even when you do it manually 1.5mm still comes up in the hole. and .057" is rougly 1.5mm. thats why zeal is saying that.

back to the whole think about it...lets do that. how can dropping in h23 pistons drop the comp so much? think of it this way. the stroke is being raised, when raising stroke you raise compression. but the head volume is also increased, which means the cr is decreased. imo the first calc i did at 9.8:1 is right. there is no way it should drop a full point.

[GhostAccord]

Never mind I went buy your original post where I didn't add in the 1.5mm worth of material removed from the head/deck. With the 1.5mm (0.059") yes your compression will jump up.

how about

H22A block = 219.5mm deck height
K24A4 Crank = 99mm stroke
H23 Pistons = 87mm bore ,30mm compression height
K20 Rods = 138mm rods
Mill & Deck head 1.5mm
You would end up with approx. what?

Now by decking the block and running 138mm rods you realize that will give you a 1.34 R/S ratio. That is really low. I've seen most builders shoot for 1.5 1.8 if possible for Honda engines. I'm sure a boosted application would warrant a look into what R/S ratio would be best.

[trah]

I passed math with a d, so that's going to be hard

it's still is passing!

[quickangel93]

i might scratch the idea its going to be to much of a headache. might just get forged rods and pistons.