ianik

Hi,

I'm looking for more power on my ITR. I'm considering two different ways, 86x89 stroker using a Dart tall block, or going supercharged using a Kraftwerks kit with the stock B18C (curently pulling strong, 20000 miles and not burning anything except gas :D).

In one case, the engine would have to cope to the long stroke, high revs and about 12 CR, on the other hand the EGT, heat on long runs (20-30 minutes of hard beat).

I dunno which setup would be the most reliable for track use. I sometimes use my ITR on roads but only on week ends for pleasure.

Muckman

iTrader: (2)

89mm stroke does not require a tall deck. LOTS of people run LS cranks in B18c's and rev to 8,9,10k without issue. Going supercharger is going to make a lot more power but it could be built and tuned to handle the heat.

wantboost

iTrader: (2)

you can even stay with an ls deck height, an 89mm stroke and run a long rod. I did it. 5.531 long rod with a piston with a .993" compression height piston

if you aren't running at least a 92mm-95mm stroke then a dart tall deck is pointless.

I'm building a dart tall deck 85x98 6" rod FI motor because I can fully utilize the extra deck height. staying 89mm with that block would require a stupidly long rod.

ianik

Which stroke is achievable with the tall deck ? I'm looking for a quite revvy engine (9krpm).

I'm looking at Dart blocks to escape from classic issues of cracked liners etc on B20vtec using B20B/Z blocks.

TheShodan

iTrader: (14)

Those "classic" issues are usually from bad assembly, and bad tune. Not the combination itself. 9K rpms isn't necessary if going with a circuit driving road course for either supercharger or stroke. Getting a Dart Tall deck requires special pistons, rods, etc. Very nice, but even MORE expensive.

Decide on what's more for you, and you can supercharge either one without damage.

ianik

Sure, if I use a B20B/Z block it will be far less expensive.

So, a B20B or Z block, pistons for more compression and valve clearance and the classic water / oil pump etc.

Was only anxious to have my engine cracked a few month after the build...

TheShodan

iTrader: (14)

That's other factors, including tuning, health of the block before you installed it all, etc.

wantboost

iTrader: (2)

you can run a 98mm stroke with a dart tall deck if you have custom pistons and rods made, like i'm doing... but with a stroke that big you won't be able to run the motor over 9k for the most part.
98mm stroke and a 6" rod is a rod stroke ratio of 1.55

ianik

Ok, I did'nt realize that the tall black was so.... tall :D

It seems that a B20B or Z, high comp pistons and a very very good tune is the best for me... A conservative 8.5krpm ang good to go.

wantboost

iTrader: (2)

The dart tall deck has a 226mm deck height.

4piston has a 85x95 dart tall deck, 13:1 static cr with a rod at least 6" along with a ported head, good cams and 50mm ITBs and a good header. it's making 330whp 200lbft on 93. when they went with 52mm ITBs it's now making over 350/220 to the wheels NA

wantboost

iTrader: (2)

dart also has an ls deck height block.