PR4 LS rods on built D16a6 w/ D16y8 head... ...Weaker or stronger than stock a6 rods?
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From: Lakewood, CO, USA
PR4 LS rods on built D16a6 w/ D16y8 head... ...Weaker or stronger than stock a6 rods?
OK, the machine shop said that the PR4 LS rods being more dense than the a6 rods will have a greater tendency to snap.
Now a local mechanic said that the LS rods are actually better for this set up than the a6 rods also they have a reputation for breaking.
so what info does anybody have on this?
Now a local mechanic said that the LS rods are actually better for this set up than the a6 rods also they have a reputation for breaking.
so what info does anybody have on this?
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From: NYC, NY, USA
Re: PR4 LS rods on built D16a6 w/ D16y8 head... ...Weaker or stronger than stock a6 rods? (S9i1R)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by S9i1R »</TD></TR><TR><TD CLASS="quote">OK, the machine shop said that the PR4 LS rods being more dense than the a6 rods will have a greater tendency to snap.
Now a local mechanic said that the LS rods are actually better for this set up than the a6 rods also they have a reputation for breaking.
so what info does anybody have on this?</TD></TR></TABLE>
1- If your maching shop is saying Pr4 Ls rods have a greater tendency to snap because of density, never go there again... LS Rods are significantly stronger than A6 rods.
2- The amount of modification required to make LS rods fit is significant, and you will need forged pistons to use them. You will need to find a COMPETENT Machine shop to do the work.
3- How much power are you looking to make? How will it be tuned? What power adders will you be using? This will affect whether or not you even need stronger rods...
Now a local mechanic said that the LS rods are actually better for this set up than the a6 rods also they have a reputation for breaking.
so what info does anybody have on this?</TD></TR></TABLE>
1- If your maching shop is saying Pr4 Ls rods have a greater tendency to snap because of density, never go there again... LS Rods are significantly stronger than A6 rods.
2- The amount of modification required to make LS rods fit is significant, and you will need forged pistons to use them. You will need to find a COMPETENT Machine shop to do the work.
3- How much power are you looking to make? How will it be tuned? What power adders will you be using? This will affect whether or not you even need stronger rods...
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Joined: Nov 2003
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From: Lakewood, CO, USA
Re: PR4 LS rods on built D16a6 w/ D16y8 head... ...Weaker or stronger than stock a6 rods? (Gpelsise)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Gpelsise »</TD></TR><TR><TD CLASS="quote">2- The amount of modification required to make LS rods fit is significant, and you will need forged pistons to use them. You will need to find a COMPETENT Machine shop to do the work.
</TD></TR></TABLE>
the mechanic that told me to use LS rods I think said to use .25mm oversize OEM pistons so that is what I have now. So what you are saying is that I'll HAVE to go with forged pistons? what other than rebushing the rods will have to be done to make the A6 pistons work? because the shop has all my stuff NOW and if there are going to be problems than I want to stop and figure out what I need.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Gpelsise »</TD></TR><TR><TD CLASS="quote">3- How much power are you looking to make? How will it be tuned? What power adders will you be using? This will affect whether or not you even need stronger rods...</TD></TR></TABLE>
OK the setup that I was planning on running D16A6 internals except LS rods, D16Y8 Head, 7.5lb Flywheel & more to come. Tuned with Hondata or equivalant. NA setup, 11.5:1 CR, 140-150 WHP. I've heard that the A6 rods are prone to snapping???
</TD></TR></TABLE>
the mechanic that told me to use LS rods I think said to use .25mm oversize OEM pistons so that is what I have now. So what you are saying is that I'll HAVE to go with forged pistons? what other than rebushing the rods will have to be done to make the A6 pistons work? because the shop has all my stuff NOW and if there are going to be problems than I want to stop and figure out what I need.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Gpelsise »</TD></TR><TR><TD CLASS="quote">3- How much power are you looking to make? How will it be tuned? What power adders will you be using? This will affect whether or not you even need stronger rods...</TD></TR></TABLE>
OK the setup that I was planning on running D16A6 internals except LS rods, D16Y8 Head, 7.5lb Flywheel & more to come. Tuned with Hondata or equivalant. NA setup, 11.5:1 CR, 140-150 WHP. I've heard that the A6 rods are prone to snapping???
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Joined: Nov 2002
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From: NYC, NY, USA
Re: PR4 LS rods on built D16a6 w/ D16y8 head... ...Weaker or stronger than stock a6 rods? (S9i1R)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by S9i1R »</TD></TR><TR><TD CLASS="quote">
the mechanic that told me to use LS rods I think said to use .25mm oversize OEM pistons so that is what I have now. So what you are saying is that I'll HAVE to go with forged pistons? what other than rebushing the rods will have to be done to make the A6 pistons work? because the shop has all my stuff NOW and if there are going to be problems than I want to stop and figure out what I need.
OK the setup that I was planning on running D16A6 internals except LS rods, D16Y8 Head, 7.5lb Flywheel & more to come. Tuned with Hondata or equivalant. NA setup, 11.5:1 CR, 140-150 WHP. I've heard that the A6 rods are prone to snapping??? </TD></TR></TABLE>
Bad Mechanic! D16 Rods have a 19mm pin. LS rods have a 21mm pin. If you run bushed rods, they use silicon bronze bushings and the wrist pin cannot be Press fitted, and must use full floating pins. Using full floating pins means that pistons must accept pin locks. Unless the machine shop is also modifying the pistons, you will need forged pistons.
Next, if you will be making only 150WHP tuned properly, don't bother changing the stock rods. Have them shot peened, have arp bolts pressed in, and have them reconditioned. These rods are fine to 200 HP.
I would get away from your machine shop though unless they have a very good explanation of all the steps involved.
the mechanic that told me to use LS rods I think said to use .25mm oversize OEM pistons so that is what I have now. So what you are saying is that I'll HAVE to go with forged pistons? what other than rebushing the rods will have to be done to make the A6 pistons work? because the shop has all my stuff NOW and if there are going to be problems than I want to stop and figure out what I need.
OK the setup that I was planning on running D16A6 internals except LS rods, D16Y8 Head, 7.5lb Flywheel & more to come. Tuned with Hondata or equivalant. NA setup, 11.5:1 CR, 140-150 WHP. I've heard that the A6 rods are prone to snapping??? </TD></TR></TABLE>
Bad Mechanic! D16 Rods have a 19mm pin. LS rods have a 21mm pin. If you run bushed rods, they use silicon bronze bushings and the wrist pin cannot be Press fitted, and must use full floating pins. Using full floating pins means that pistons must accept pin locks. Unless the machine shop is also modifying the pistons, you will need forged pistons.
Next, if you will be making only 150WHP tuned properly, don't bother changing the stock rods. Have them shot peened, have arp bolts pressed in, and have them reconditioned. These rods are fine to 200 HP.
I would get away from your machine shop though unless they have a very good explanation of all the steps involved.
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