The B20VTEC discussion thread

[yaz_gsi_my_titz]

using a b18cr crank will result in a 1.9 litre. 87mm crank vs 89mm b20/gsi crank

[ewendc2r]

using a b18cr crank will result in a 1.9 litre. 87mm crank vs 89mm b20/gsi crank

Techincally closer to 2L than 1.9L lol !! :P

[ewendc2r]

1956cc ..

[string]

I get 1932cc...

[ewendc2r]

84.5?? Hmmm

[GSi_PSi]

irrellevant, using a 89mm will give you more capacity

[string]

84.5?? Hmmm

<= blind

[ewendc2r]

irrellevant, using a 89mm will give you more capacity

So? Itr stroke will rev better and the difference in cc is **** all .. Better r/s ratio, fully counterweighted, and the small difference in cc can be made up with a small increase in bore ie 85 mm ... In fact, without going to 92mm crank with tall deck, this is supposedly the best base for reliable performance.... Just more $$ than 89mm crank

[eg5civic]

So? Itr stroke will rev better and the difference in cc is **** all .. Better r/s ratio, fully counterweighted, and the small difference in cc can be made up with a small increase in bore ie 85 mm ... In fact, without going to 92mm crank with tall deck, this is supposedly the best base for reliable performance.... Just more $$ than 89mm crank

lol how much is an 89mm crank...

i got an itr crank rod and pistons for 200 wnd hand and in good nick

and doesnt look like they will ever see my b16b

[GSi_PSi]

if you want a reliable long lasting b20 i suggest you use the standard crankshaft 89mm which is already balanced from factory and dont mess with the already thin sleeves.
Using a ITR crank will decrease capacity and torque. the B20/gsi 89mm crank is free with a b20 engine lol. otherwise it wont be more than 50 bucks

[ewendc2r]

Yep cheap enough -- but they don't come in a 84mm+ bore do they.. I mean, you have to spend time and or money installing it into the block.. More $$ than simply changing rod bolts for a budget build. Likely need to get an align hone to make sure mains are correct and measure for bearings / journal clearance.. more $$ ...

Thats what i'm getting at. 89mm is used primarily because its the easiest - the B20B comes with the crank already in it.

Race application most people use either 87.2mm crank or 92mm crank in the states ... 95mm crank is mainly used only for drag races it seems due to increased bearing and side loading.

Even some of the reputable engine builders on this forum have recommended itr crank for high performance application and that the difference in actual output is minimal.

edit -- when i say race application, i mean the big budget guys.

[ewendc2r]

GsiPsi i am looking to go sleeved block mate. And there are harmonics issues with the b20 crank at high rpm. I'm talking endurance motor capability.

I'm just thinking fo the rod/stroke ratio and longevity of engine... The B20 Crank is lighter than the ITR crank though ....