B20 block with B18 crank

[spetz]

Just wondering...
I see a lot of MIVEC 1.6 owners using 1.8 or even 2.0L blocks with the 1.6 crank and longer rods so that the rod/stroke ratio gets better and they easily rev to 10,000+ rpm for street use

Do Honda people do this same thing?
As I know a B16 has a better R/S ratio than B18, so couldn't people just use B18 crank in B20 block?

[SHIFTY]

well ppl have b20vtec engines which is a b20 bottom end with a b16 top end... like u mentioned... it basicly gives u the torque of the 2.0 but revs like the 1.6L which is pritty awesome :)

few ppl have them and they seem 2 go really well....

[marcus]

yup....coz its tooo expensive to do a b20 setup...its the same for the k series...type R head with k24 block gives u super rev, power and torque

[kyle]

well ppl have b20vtec engines which is a b20 top end with a b16 bottom end... like u mentioned... it basicly gives u the torque of the 2.0 but revs like the 1.6L which is pritty awesome :)

few ppl have them and they seem 2 go really well....

I think you mean B20 bottom and B16 top? LOL :p

Sik, convert my B16, to NON VTEC b20 head lol

[SHIFTY]

i dono man, woteva

i 2 tired 2 be thinking properly... lol

thanks for the correction :)

just do it man! DO IT ! :P

[ZeForce]

Just wondering...
I see a lot of MIVEC 1.6 owners using 1.8 or even 2.0L blocks with the 1.6 crank and longer rods so that the rod/stroke ratio gets better and they easily rev to 10,000+ rpm for street use

Do Honda people do this same thing?
As I know a B16 has a better R/S ratio than B18, so couldn't people just use B18 crank in B20 block?


The B20 uses the exact same 89mm crank as the B18a/b which is only slightly bigger than the 87.2mm B18c crank. The increase in displacement comes from a larger bore. To get any real benefits u would need to use a 77.4mm B16a crank or a 81.4mm crank from the USDM B17a, if u could find one.

[EG5]

yup....coz its tooo expensive to do a b20 setup...its the same for the k series...type R head with k24 block gives u super rev, power and torque

which k24 block that will gives super rev with type R head :confused:

[kerim]

well ppl have b20vtec engines which is a b20 bottom end with a b16 top end... like u mentioned... it basicly gives u the torque of the 2.0 but revs like the 1.6L which is pritty awesome :)

few ppl have them and they seem 2 go really well....

yeah man i got that setup in my civic too

[JohnnyVtec]

The B20 uses the exact same 89mm crank as the B18a/b which is only slightly bigger than the 87.2mm B18c crank. The increase in displacement comes from a larger bore. To get any real benefits u would need to use a 77.4mm B16a crank or a 81.4mm crank from the USDM B17a, if u could find one.



;) The only problem with that idea is the aftermarket $500.00USD crower connecting rods you have to buy in order to use the B17a crankshaft in the B16a block. since the B16a/B17a rods will not work properly.

[DynoDave]

Just wondering...
I see a lot of MIVEC 1.6 owners using 1.8 or even 2.0L blocks with the 1.6 crank and longer rods so that the rod/stroke ratio gets better and they easily rev to 10,000+ rpm for street use

Do Honda people do this same thing?
As I know a B16 has a better R/S ratio than B18, so couldn't people just use B18 crank in B20 block?
Whats wrong with B20 rod ratio's and who said you cant rev them,and why would you want to rev it to 10,000rpm anyway the cost of building a cylinder head to do that is way out of the reach of 99.9% of most peoples budgets anyway.
Regards Dyno Dave

[DynoDave]

yup....coz its tooo expensive to do a b20 setup...its the same for the k series...type R head with k24 block gives u super rev, power and torque
Do you know what rod ratio the K24 and the B20 have ?
Regards Dyno Dave

[spetz]

I thought B20 has a 95mm stroke?

Anyway guys you kinda missed the question
It was more to use a B20 block but a B16 crank (assuming the B20 block is taller)
So that the rod can be longer and safer to rev due to the rod ratio

Obviously if you want to stick to a 1.6 and want to rev it

Anyway, not interested in it, just wondering as I mentioned I see some MIVEC motors built like that (1.8 block with 1.6 crank and head etc)

[ACTI0NMAN-1]

well ppl have b20vtec engines which is a b20 bottom end with a b16 top end... like u mentioned... it basicly gives u the torque of the 2.0 but revs like the 1.6L which is pritty awesome :)

few ppl have them and they seem 2 go really well....

you would still have the rev limit of the b20 not the b16. as the b20 has the lower rpm limit, unless you build the bottom end to sustain that type of revs.

[bennjamin]

you would still have the rev limit of the b20 not the b16. as the b20 has the lower rpm limit, unless you build the bottom end to sustain that type of revs.

Isnt "buidling a B20 bottom end" (at a minimum) , replacing the conrod bolt ends to cope with the sustained rev load ?

[ZeForce]

Isnt "buidling a B20 bottom end" (at a minimum) , replacing the conrod bolt ends to cope with the sustained rev load ?

Not sure if that is classified as "building the bottom end", I look at it more as a form of reinforcing.

[fatboyz39]

Yes b20 bottom end are strong. Just need to change the ROD bolts. Our current b20/vtec V2 stock bottom end with rod bolts change and revs to 8200rpm daily. We hit 9000rpm once with no dramas.

[tinkerbell]

problem is on stock bottom ends with 10:1 CR it is difficult to make extended power beyond 8200...

the beauty of B20VTEC is the large amount of early torque complemented by significant power of the VTEC stage...

to the OP:

yes, a B18C crank in B20B bottom end would be fine, however, you would need aftermarket pistons (and maybe rods) though...

[TODA AU]

Just wondering...
As I know a B16 has a better R/S ratio than B18, so couldn't people just use B18 crank in B20 block?

Yes you could.
You could even use a B16 crank of you really wanted.
Strokes are as follows:
B16A ~ B16B - 77mm stroke
B18C - 87.2mm stroke
B18A ~ B20B/Z - 89mm stroke
95mm is stroker crank from B20
Any can be used,
Rod length varies depending on block & crank used.

We have an 85mm bore B18C leaving the shop shortly,
It's basicly the set up you're talking about.
B20 bore with B18C stroke.

[flipstar]

y would u wanna push a b20vtec past 10k rpm anyways isnt der higher chance of cracking the piston sleeves and isnt peak power at 7.8k rpms