https://honda-tech.com/zerothread?id=951003

there is a link to his pistons and SOME specs

I'm not wonderfull on ANY of my math and i wont claim to be, i'm just trying to find out what rod size to use with this setup. I want a good r/s ratio because this is going to be a road race car but i wont to get some more dispacment.


So, just for the record,

I want to use the Tech43 pistons (.851 comp height) in a gsr block ( 8.347 deck height ) and a 92mm crank ( 3.62204 )

I need more help, this will be my first none oem length motor :-).. lol SOMEONE HELP MEE!!


this is just some of the info i had jotted down, if anyone can help, or if this will help

3.50393 89mm crank
3.62204 92mm crank
.11811 3mm bigger than 89mm crank
.349 differance between b16 and gsr deck height
5.045 rod legnth on stock pistons with 92 mill crank
5.394 Stock LS rod length
5.62489 added deck hight, minus .11811 for the 92 mill crank
5.743 Added Deck height


no matter what math i do, it never equals within .001 - .003 of the stock gsr deck height ( 8.347 )

I got all of my info from http://raceseek.com/honda_specs.htm


Thanks in advance, please no flamming, this is my first wack at it!

-Josh

 

What are you trying to do?

Why do you want the tech43 pistons; if you're using the gsr block?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 187.fuckvtec. &raquo;</TD></TR><TR><TD CLASS="quote">What are you trying to do?

Why do you want the tech43 pistons; if you're using the gsr block?
</TD></TR></TABLE>

he wants to use these pistons with a 92MM crank inside a B18C instead of the 89MM crank in a B16A...

thats way too many numbers for me i cant help him out..lol

 

Ask Tech43, seems pretty simple.

 

or u can call him , Steve can help you 310-697-3305

 

To calculate rod length:

Deck Height - Stroke in inches/2 - Compression height - Desired deck clearance = Rod length

To calculate compression height:

Deck Height - Stroke in inches/2 - Rod length - Desired deck clearance = Compression height

 

. 8.347 = Deck Height
- 0.020 = Top of piston in the hole .020 (Stock?)
- 0.851 = Compression Height of Tech43 piston
- 2.362 = 1/2 of 92mm Stroke
= 5.114 Rod length?

1.41 R/S Ratio

This is my best guess with the numbers that I have.

 

got everything orderd, r/s came out to be a 1.52 or 1.54 i forget now, something you did was wrong

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TOR &raquo;</TD></TR><TR><TD CLASS="quote">. 8.347 = Deck Height
- 0.020 = Top of piston in the hole .020 (Stock?)
- 0.851 = Compression Height of Tech43 piston
- 2.362 = 1/2 of 92mm Stroke This is not correct, 46mm is 1,811"
= 5.114 Rod length? So he will end up with a rod lenght of 5.665"

1.41 R/S Ratio 1.564

This is my best guess with the numbers that I have.</TD></TR></TABLE>

Too bad you got the stroke all wrong, but with the correct # it looks a bit better.

 

top $$$ custom rods $$$ yeehaa

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TOR &raquo;</TD></TR><TR><TD CLASS="quote">2.362 = 1/2 of 92mm Stroke</TD></TR></TABLE>

92/25.4 = 3.622

3.622/2 = 1.811

 

This is what I get for doing math in the dark. I mixed up my strok numbers...Or I'm just a Tard either way the motor sounds like fun.

 

Going back I realize 2.362 = 1/2 of 119mm Stroker Crank! 4.724 Stroke! R/S of 1.082 Ouch! Thats like trying to shove the piston through the cylinder every stroke. Might make a great Diesel motor?

 

So for Pondus and others with similar builds:


8.897637795 = Tall Deck Height
minus 1.87007874 (1/2 of 95mm Stroke)
minus 5.967 (Rod length)
minus desired deck clearance
= compression height
1.595387 rod/stoke ratio

(with an 87mm crank, it would be a 1.74 rod/stroke ratio.....)



Modified by Black R at 2:13 PM 5/11/2005