ctr's on ls rods? - Honda Forum / Acura Forum

mig_909 · 08-02-2005, 02:25 PM

i was doing some research and found that ctr pistons do not fit ls rods, is this true? and if so, what rods do i use

Leitner · 08-02-2005, 04:46 PM

the small end of the rods need to be machined narrower to fit into the piston. you should have about .060" min clearance per side. if you have an ls bottom end and you are set on using the ctr pistons then you are stuck with those pr4 rods.

mtber · 08-06-2005, 10:55 PM

I recommend milling the piston instead of the rod.....

HBracer · 08-07-2005, 08:08 AM

do all the aftermarker rods fit in the ctr's? (eagle,crower,pauter,etc.)

Leitner · 08-07-2005, 12:16 PM

no they dont. ctr pistons are used with interference fit pins (for oe rods). aftermarket rods use a floating pin so they dont work together. and you dont have circlips on the ctrs so if you tried the pin would come out and severly damage the bores. machine the rods not the pistons. you will be machining them to the same width as the b16 rods taking material out of the pin bosses weakens the pistons, the bosses are the only thing that keeps you pistons from coming off the rods at tdc when the piston changes direction and so you dont want to go messing with them.

HBracer · 08-07-2005, 01:55 PM

this doesnt weaken the rod?

Leitner · 08-08-2005, 05:21 AM

HBracer · 08-08-2005, 12:31 PM

so do itr rods require the same trouble? or are they floating pin

Leitner · 08-09-2005, 06:51 AM

all stock b series rods are interference fit pins and you couldnt use the p73 rods on an ls crank because the pistons will stick out the top of the block. (p73 rods are longer) you will be fine modding the ls rods, i have done this mod many times with no problems.

HBracer · 08-09-2005, 03:02 PM

Quote:

Originally Posted by Leitner

all stock b series rods are interference fit pins and you couldnt use the p73 rods on an ls crank because the pistons will stick out the top of the block. (p73 rods are longer) you will be fine modding the ls rods, i have done this mod many times with no problems.

sorry i meant pistons

Leitner · 08-10-2005, 02:30 PM

all b series oem pistons are interference fit.

HBracer · 08-10-2005, 03:01 PM

what would be required to convert teh rods over to floating pin? and how much would it cost?

Leitner · 08-11-2005, 04:37 AM

you have to mod the rods to use a brass bushing in the small end. its better to spend a bit more and go get the crower fast times rods about $400 for the set of 4. Part# A93828B-4 for the LS

here is the write up.

CROWER ECONO BILLET RODS
In an effort to deliver a competitively priced connecting rod, Crower has partnered with an overseas company to manufacture a 4340 steel billet rod that can be used in all motor and limited boost/nitrous applications. The difference between the Econo rod and all other inexpensive brands is that Crower finishes the Econo rod in-house to the same exacting standards and tolerances that Crower1s Premium Billet rods undergo. The result is the highest quality, economically priced rod available on the market. Only available for certain Acura/Honda applications at this time. Other makes to be considered.

HBracer · 08-11-2005, 04:46 AM

i saw the crower econo's on inlinefour they sound like a good insurance. i guess that $400 would be better than thousands on a new setup because i threw one of the stock ls rods out the side of the block.

Leitner · 08-11-2005, 06:55 AM

bingo...eliminating all the potential problems is how you keep it alive. now there is one other option, if you are getting forged pistons and rods i recommend getting longer rod to improve your rod stroke ratio. Endyn sells the longer rods and the pistons that have the pin moved up giving you a 1.65:1 r/s ratio compared to the1.52:1 on the stock LS and this will give you some extra longevity to your engine buy reducing the angle of the rod in the bore.