why cant you use a b20a crank to turn ur 1.8 to a 2.0l? what are the rod/stroke ratios for it? wouldnt it be the same if you got a custom crank from crower, jun, etc.???
The difference is in the bore, not the stroke!
no i thought it was only the b20b/z that had a 84mm bore and the b20a has a 81mm with a long stroke which gives it the 2.0L. iono i could be totally wrong but im asking about the motor that came in the old school preludes.
2simplex is right. They came out of the 88-91 Preludes. It’s pretty much a stroked B18A and isn’t all that it’s cracked up to be. Not reliable either and their R/S ratio is awful - in my opinion the worst B-series motor from Honda.
Originally posted by Ive
Not reliable either and their R/S ratio is awful - in my opinion the worst B-series motor from Honda.
Ask anyone who knows about their own cars (people who don’t go to Jiffy Lube to get the oil changed) about their 89-91 Preludes. Each one of them will tell you what a garbage engine it is. That is why you have yet to see them used in hybrid applications.
Jordan
You don’t want to do that! The old prelude B20A’s were horrible engines because of those cranks. It is probably the only engine Honda ever made that is flat-out bad, and they now regret it. The horrid R/S ratio basically made the piston grind against the cylinder wall much more then our B18A’s, which has a relitivly poor R/S ratio itself. They wore out quick, and that’s why you never hear of this “long-lost” B-series engine. Another couple points to make about the B20A is that it took a head that is not compatible with other B-series blocks, and they made about the same power as a B18A.
Long story short, just don’t do it.
BTW, the R/S is 1.49 or 1.50 depending on the model year, and that’s compared to our 1.54, a B18C’s 1.58, and the B16A’s 1.74. The B20A’s rods were 141.7mm or 142.75mm, also year dependant, with a 95mm stroke.
then just outta curiousity wha is the rod/stroke ratio on say a crower crank our the jun crank???
as i recall, the '91 prelude si made 140hp and i believe 135ftlbs. I raced my buddies once long time ago at a stop light stock for stock. My '90 rs completely walked away from him twice in a row (we were more even at hiway speeds tho). He had about 200 000kms or so on it i believe and i probably had half. He eventually traded it in at about 220kkms 'cause of too many problems, like oil leaking out of everywhere, including a cam seal which he did replace. He also burned enough oil to fart blue smoke. junk junk
d
ps 220kkms is like 130kmiles or so
Originally posted by 2simplex
then just outta curiousity wha is the rod/stroke ratio on say a crower crank our the jun crank???
I couldn’t tell you offhand… what are the specs of the crank and the rod you use? In case you didn’t know, you couldn’t use the stock rods, and the cranks are usually part of a custom crank, rod, and deck block set. If you could post that info, I’m sure someone can calculate the R/S for you.
WHOOPS you said crank, sorry
so if i go with a JUN / CROWER stroker kit, they will build it for me with a good r/s ratio [1.7 good???]??
For the cost of a stroker kit, you might as well just have the blocked resleeved and bored to 84-84.5mm to give you around 2 liters, but only if you’re in Kali. If you live outside of that communist hellhole (no insult to the populus, just the state government) then you should just drop in a B20B/B20Z block. Much cheaper then a stroker kit, but a stroker kit does have a better R/S ratio. Stroker kits are usually optimized for the application, a B18 to 2.1 liter kit would usually yeild about a 1.65-1.8 R/S.
aiight thanks KAI for answering my questions, i might jus stick with resleeving my block, but i heard that it can cause overheating problems when driven daily.
Overheating? No, not at all… that really only occurs with poorly engineered deck blocks (some prevent coolant from getting close to the cumbustion chamber, a very, very hot part of the engine)
The Crower stroker kit comes in two forms actually. One with an OEM Honda B20A5 crank and custom rods, and one with a custom billet crank and rods.
b20a5? the crank from a 3rd gen prelude??