I pulled the trigger on Wiseco pro tru pistons. I have prepped and polished stock rods with ARP bolts. What would be a safe rpm limit for this set up? The limit I have is 6,000 rpm and a good roller cam grind for mid range torque and 600 max hp. Since its mostly going to be street driven around 2000-4000 rpm should I worry about occasional bursts to 6,000 with the heavy wiseco pistons?
I've taken stock rods with heavy TRW's and Wiesco's to 6800 and a couple times even more . my last combo ran 10.80s and I shifted at 6400 and went across at 6800. Would I have felt better about it with Forged rods...of course
Honestly, with the rod choices we have now, why would you stick with stock rods, even well prepped ones? 600HP/6000 RPM? I'd want a better rod.
110% agree, when all we had was $900 Crowers it was different, but with $500-$580 drop in rods it's somewhat foolish to not use them for anything over 550
I think those pistons are similar in weight to my JE's. I had a stk rod combo in a full race motor runnig 10.90s. Motor had over 2200 passes when I had to retire that block due to a pin hole in #4. We did burn outs at 4500 to 5000. Shifter at 6250 to 6500 in both gears, went through the traps at 6250. Never had an issue with the stk rod. Those piston are about 200 grams lighter than stk I think
Thanks for your feedback guys. My reasoning to use the stock rods was cost. I know im taking a 'bit' of a gamble here with the rpm and hp I intend to punish the rods with, however they will only see the high side of 6000 on occasion. All your feedback was much appreciated :TU:
Why would you worry and fret about 600 HP and then decide that you really aren't going to push it to the rpm where it makes 600 HP? I'm pretty sure with pump gas compression a 455 is going to have to hit 6000 rpm to make 600 HP. A bigger engine could make it at a little less rpm or very high compression. Plus you want to install an intake that works best at higher rpm. If you feel lucky like 99GTP or you have hit the lottery lately use the stock rods. Also get a rev limiter set at 6000 rpm. Again, if you've been so worried about 600 HP for so long now wait a little while, save up a couple more bucks and buy the better rods.
It's how I intend to drive the car. Highway driving mostly. I have every intention of using all the hp and have fun with it, but I do plan on "playing nice" with it to. A good performer with decent street manners. I am putting a rev limiter on it where it reaches 600hp or 6000 rpm (whichever occurs first).
A old military saying is " there's always money to fix it again , but never money to for doing it right the first time!" So you can't afford 600 bucks in Rods now , yet your willing to run the risk of blowing up the whole short block and maybe taking a cylinder Head out with it? I'am baffled here!
I already have a finished set of rods with all the works done to them that is why im using them. I might still get some TA rods, but until I send the motor to my machinist im not set in using the stock rods.
Hi Larry, Quick question...what would be your choice for the best value in an upgraded rod over the stock ones. I am upgrading to the Wiseco pistons as well on my non-stroked 455. ...was just going to use the stock ones, but T/A has a few different choices. Thanks!
Bob, When JW built my 470, he used the 6.8" Eagle H beam rods. That requires offset grinding the rod pins and widening them a bit. Nowadays, we have drop in rods, I forget the manufacturer, but they are a no brainer as far as I am concerned. I'm sure JW could tell you. I believe we will also have rods for a 482 stroker sometime this Spring. I can't imagine why anyone building an engine would want to use the commonly available pistons, and stock rods, when you can get a custom set of Diamond pistons with the better compression distance to get 0 deck, and use better rods to get the extra cubic inches. There are no downsides to doing so. I'd be selling those Wiseco pistons if it was me. Had the rods we will have soon been available when my 470 was built, I would have just done a 482. JMO.
It's not about winning the lottery, it's about "investment protection". At 6000+rpm, forged rods have better odds of surviving than stock rods, plain and simple. Sure, stock rods may be ok, but why risk it when there are better options now at reasonable prices? I'm with Larry and No Lift on this one. I'm currently building a 455 and have been agonizing and obsessing over what to throw in it. I was going to run the TA 1621 pistons with stock rods w/ ARP bolts (all of which I already bought), but have changed my mind with the availability of these waaaaaay better than stock Molnar rods. I'm just waiting to see how the rod bearings are going to work for them.
