B20B with CF4 Pistons

[Johnny_9]

Overheating?
Compression Ratio?

 

[hattech-v]

what is the CF4 piston size?

 

[Mellon@]

cf4 85mm

overheating no such things if it is done properly
compression around 11.+

 

[Danny101]

cf4 85mm

overheating no such things if it is done properly
compression around 11.+

agreed, my previous honda with the same set up has no overheating and knocking.........even hantam kau kau.....

 

[399]

yes...danny, after u hantam, the new owner suffered. pity him mate.....

 

[Johnny_9]

Cams

Danny - what cams u use on yr B20B/CF4

 

[basahboy]

hmmmm...most of the otai i spoke with were not favorable of the CF4 combi with B20B largely because of the shape of the dome which in LT not good...the otai were from Amoil and my own mechanic...i was deliberating on it because was tempting to use the same set up in my B20B..well maybe i am wrong...for whats worht this is educational for melah..

 

[Johnny_9]

Lt?

whatz LT?

 

[basahboy]

whatz LT?

Long Term...

 

[Danny101]

Danny - what cams u use on yr B20B/CF4

toda c bro.........cheers

 

[399]

danny,
what cam pulley u were using? & also valve, valve spring, piston, conrod, crankshaft & engine oil?.............cheers

 

[Johnny_9]

Best 84.5mm pistions (12.5:1 CR) ?

Wiesco?
JE?

Which has the best thermal expansion factor?

 

[J101]

BEST?

if you are looking for ceramic, molybdenum and teflon coated pistons maybe you should give Cosworth UK a call and have your piston custom sized to suit your extreme heat expansion factor if you plan to run in extreme condition or methanol injected vehicle.

Best 84.5mm pistions (12.5:1 CR) ?

Wiesco?
JE?

Which has the best thermal expansion factor?

 

[Johnny_9]

OK, not the best - heard TODA has an thermal expansionn factor close to stock, and that why closer tolerances can be run (= better ring seal & more power). But TODA dont make 84.5mm pistons !!! So I was wondering what is the next best choice

CP
Wiesco
JE
Other??

I am guessing, but if the "thermal expansion" factor is "poor quality" this can scratch your bore ????

Next, if you wanted to do 85mm on sleeved block, what is better a B18C5 block or a B20B block?

 

[J101]

But TODA dont make 84.5mm pistons !!! So I was wondering what is the next best choice
3 weeks ago i went to ss-racing in old klang road. i saw brand new boxes of toda pistons for 81mm, 82mm and 83mm for honda b-series.
you might want to check the online catalog :
TODA Racing USA - HONDA B16A/B18C High Power Piston Kit
you might want to enquire toda or jun since they do make custom parts for individual as long your enquiries are legitimate, serious and willing to pay.

Next, if you wanted to do 85mm on sleeved block, what is better a B18C5 block or a B20B block?
on a sleeved block any block would be better for the 85mm. since the b20 has bigger displacement size, so u have more option to upgrade from there.