Better Rod Stroke Ratio For LS/B20?
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From: Orange County, CALIFORNIACATIONATED, USA
Better Rod Stroke Ratio For LS/B20?
..i was just takin a stroll around my head and came up with the idea of using B18C (spec) rods (aftermarket) in my B20! then get custom pistons with raise pins to make up for the additional 0.9906mm of extra rod lenth!?! it may not seem like a lot but in engine terms (internal) ".9906mm" is a lot. im just wondering what you guys think..would it be worth it? my point of view (short on cash 
) is that custom pistons is aready gonna cost you an arm but custom rods is gonna add a leg!! so buy some stronge aftermarket rods that are *already produced (B18C)* so that you dont have to pay any "custom fabrication fees"...
..or maybe it wont be worth it because you can already 9k if properly built..and you wont really need to rev past that since cams dont usaully make power past that......?
? 
? 
!
>*****! i completely forgot to say that i had this in mind for a LS/CR-VTEC aplication!<
[Modified by 10K2HVN, 9:06 AM 3/30/2003]
) is that custom pistons is aready gonna cost you an arm but custom rods is gonna add a leg!! so buy some stronge aftermarket rods that are *already produced (B18C)* so that you dont have to pay any "custom fabrication fees".....or maybe it wont be worth it because you can already 9k if properly built..and you wont really need to rev past that since cams dont usaully make power past that......?
? ? !>*****! i completely forgot to say that i had this in mind for a LS/CR-VTEC aplication!<
[Modified by 10K2HVN, 9:06 AM 3/30/2003]
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From: Toronto, Canada
Re: Better Rod Stroke Ratio For LS/B20? (10K2HVN)
i dont think it will work or someone would have already done this......
i belive if you raise the piston pin any higher it will come really close with the oil ring lands.....
you best bet would be to find a B18C (B17 would be perfect) crankshaft and have a set of custom rods made up for it......
honestly though i dont think all this work is worth the time, money and effort. there are plenty of guys making big power on a stock LS/B20 crankshaft........it's perfectly fine.......
i belive if you raise the piston pin any higher it will come really close with the oil ring lands.....
you best bet would be to find a B18C (B17 would be perfect) crankshaft and have a set of custom rods made up for it......
honestly though i dont think all this work is worth the time, money and effort. there are plenty of guys making big power on a stock LS/B20 crankshaft........it's perfectly fine.......
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From: Orange County, CALIFORNIACATIONATED, USA
Re: Better Rod Stroke Ratio For LS/B20? (non-VTEC)
i dont think this is 56k friendly so heres a link. those PINS are right in the oil ring..!
"Note that the wrist pin is located in the oil ring groove and that the top ring has been moved as high as possible. The 86mm pistons (pictured in finished and raw dome to the left) weigh a scant 285gm."
[Modified by 10K2HVN, 9:03 AM 3/30/2003]
"Note that the wrist pin is located in the oil ring groove and that the top ring has been moved as high as possible. The 86mm pistons (pictured in finished and raw dome to the left) weigh a scant 285gm."
[Modified by 10K2HVN, 9:03 AM 3/30/2003]
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From: Kansas City, MO
Re: Better Rod Stroke Ratio For LS/B20? (10K2HVN)
If you want a high revving powerplant, your going to lose displacment unless your willing to fork out a ton of money for custom rods and pistons.
You CAN however, get a b20 block, a b16 crank, and LS rods, for a 1.7l engine with a rod ratio of 1.77:1 (same as B16B) and you can use any B20 aftermarket pistons to raise compression.
You CAN however, get a b20 block, a b16 crank, and LS rods, for a 1.7l engine with a rod ratio of 1.77:1 (same as B16B) and you can use any B20 aftermarket pistons to raise compression.
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From: Orange County, CALIFORNIACATIONATED, USA
Re: Better Rod Stroke Ratio For LS/B20? (hybridvteceg)
If you want a high revving powerplant, your going to lose displacment unless your willing to fork out a ton of money for custom rods and pistons.
You CAN however, get a b20 block, a b16 crank, and LS rods, for a 1.7l engine with a rod ratio of 1.77:1 (same as B16B) and you can use any B20 aftermarket pistons to raise compression.
You CAN however, get a b20 block, a b16 crank, and LS rods, for a 1.7l engine with a rod ratio of 1.77:1 (same as B16B) and you can use any B20 aftermarket pistons to raise compression.
>B16A Rods = 134.366mm, B18A/B Rods = 137.0076mm; thats means that the B18A/B rods are 2.6416mm longer then the B16A rods..the B18's have a 7mm higher deck height then B16A's..so how is 2.6416mm suppose to help with a 7mm higher deck height..? Plus the fact that you are adding a Shorter Stroke??? Sure it would all fit and run but there will be a -10.3584mm difference in piston to deck height (B20 block, B16 crank, B18A/B rods, any aftermarket-shelf B20 piston)!
Also, if you had a B20 with a R/S ratio of B16B then you couldnt use it because the sleeves would crack above 9k rpm (sure you are able to get away with it a couple of times)!
i wouldnt say its worth the time money and headaches at all
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From: Vail, CO, US
Re: Better Rod Stroke Ratio For LS/B20? (TIroneous)
Larry has a long rod kit on his site under pistons in componets section.
They have pistons with relocated piston pins to run slightly longer eagle rods.
They have pistons with relocated piston pins to run slightly longer eagle rods.
Thread Starter
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From: Orange County, CALIFORNIACATIONATED, USA
Re: Better Rod Stroke Ratio For LS/B20? (TIroneous)
i would have just bored out a b18c to a 2.0........ oh well.
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From: HTown, TX, US
Re: Better Rod Stroke Ratio For LS/B20? (10K2HVN)
I run the longer rod Endyn setup and it gives me the same R/S ratio as a GSR in my B20/VTEC, but doesnt put the wrist pin in the oil ring. email him, he'll gladly write you a book/email about it... staff@theoldone.com
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From: Woodbridge, NJ, Middlesex
Re: Better Rod Stroke Ratio For LS/B20? (acura_typer)
I run the longer rod Endyn setup and it gives me the same R/S ratio as a GSR in my B20/VTEC, but doesnt put the wrist pin in the oil ring. email him, he'll gladly write you a book/email about it... staff@theoldone.com
yup he moves pin up 250 thous " and gives a nice RS Ratio ... built many of these with his pistons, customers been very happy with them.check out http://www.gbrtuning.com for price quotes on engine packages, etc.
or just email Larry at staff@theoldone.com like acura_typerr said.
greg
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From: Gresham, Oregon, USA
Re: Better Rod Stroke Ratio For LS/B20? (notstock93)
If you want a high revving powerplant, your going to lose displacment unless your willing to fork out a ton of money for custom rods and pistons.
You CAN however, get a b20 block, a b16 crank, and LS rods, for a 1.7l engine with a rod ratio of 1.77:1 (same as B16B) and you can use any B20 aftermarket pistons to raise compression.
You CAN however, get a b20 block, a b16 crank, and LS rods, for a 1.7l engine with a rod ratio of 1.77:1 (same as B16B) and you can use any B20 aftermarket pistons to raise compression.
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From: Vail, CO, US
Re: Better Rod Stroke Ratio For LS/B20? (Kataku2K3)
If you want a high revving powerplant, your going to lose displacment unless your willing to fork out a ton of money for custom rods and pistons.
You CAN however, get a b20 block, a b16 crank, and LS rods, for a 1.7l engine with a rod ratio of 1.77:1 (same as B16B) and you can use any B20 aftermarket pistons to raise compression. Tho we aren't talking about this, I just thought would would bring it up... First off using LS rods and a 77.4mm B16A/B crank does generate a 1.77R/S however this is not the B16B's ~1.86R/S... LS rods are made shorter to make up for the additional 11.6mm of stroke... All this means is that when your with a B16 crank at TDC your piston will sit ~11.6mm's below standard TDC point... Having the B20's 270mm deck you could use CTR rods and B16A/B crank to achieve the CTR R/S.... Again all this is just to correct the little error above so just ignore me... Your crank will hold up just fine... I have several friend's with high compression CRVTEC's that have been running for over a year now and they're all running just fine... 84.25-84.50mm bore on stock sleeves, 12.0-12.5:1 compression, and 8400-8800rpm... 20,000miles+ and still running fine with not a cracked sleeve yet... 12.5:1 with JUN3's feels nice.. hehehe... Without launching there's NO traction till the top of third on 17's in my friend's EK... hehe Good Luck
You CAN however, get a b20 block, a b16 crank, and LS rods, for a 1.7l engine with a rod ratio of 1.77:1 (same as B16B) and you can use any B20 aftermarket pistons to raise compression. Tho we aren't talking about this, I just thought would would bring it up... First off using LS rods and a 77.4mm B16A/B crank does generate a 1.77R/S however this is not the B16B's ~1.86R/S... LS rods are made shorter to make up for the additional 11.6mm of stroke... All this means is that when your with a B16 crank at TDC your piston will sit ~11.6mm's below standard TDC point... Having the B20's 270mm deck you could use CTR rods and B16A/B crank to achieve the CTR R/S.... Again all this is just to correct the little error above so just ignore me... Your crank will hold up just fine... I have several friend's with high compression CRVTEC's that have been running for over a year now and they're all running just fine... 84.25-84.50mm bore on stock sleeves, 12.0-12.5:1 compression, and 8400-8800rpm... 20,000miles+ and still running fine with not a cracked sleeve yet... 12.5:1 with JUN3's feels nice.. hehehe... Without launching there's NO traction till the top of third on 17's in my friend's EK... hehe Good Luck
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From: Vail, CO, US
Re: Better Rod Stroke Ratio For LS/B20? (acura_typer)
I run the longer rod Endyn setup and it gives me the same R/S ratio as a GSR in my B20/VTEC, but doesnt put the wrist pin in the oil ring. email him, he'll gladly write you a book/email about it... staff@theoldone.com
Thread Starter
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From: Orange County, CALIFORNIACATIONATED, USA
Re: Better Rod Stroke Ratio For LS/B20? (Kataku2K3)
thats exactly what i was tryin to say..! and i was thinking about CTR rods but got to lazy to repost or edit... ..i wanted to use RS Machine Rods with their sleeves but ill look into Endyn Kit..
..i wanted to use RS Machine Rods with their sleeves but ill look into Endyn Kit..
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