Hp limit of drop in rods and pistons? Cms?
 

I want to and will turn my car up but I don’t want to blow right past a known limit.

Word is cms had a main bearing fail at around 1000rwhp. It would be great if they chimed in. Seems like they only rate the parts to 1000fwhp so not knocking them at all.

If this is true then it seems like we know the limit but there is a little more to it in my mind. If this was a Procharger and measured on a mustang dyno that could easily be a 300+rwhp difference compared to a turbo on a dynojet is far as the abuse to the motor goes.

Not sure if that was clear. A Procharger belt is sapping 100-200hp that the engine has to make. A dynojet reads something like 8% higher than a mustang.

I have spoke with CP (Who makes the rods and pistons in the CMS kit) They said the typical stuff about tune (tuner capability), fuel, ring gap etc. But in the end I was told the rods could support in excess of 1200 horsepower. This has been seen as there are procharged cars making 1000whp+ and as you have stated the pulley is killing power.

I was also informed by CMS that the limit was the main cap, and was informed that they tend to "walk" around 1000whp, but it was not made clear if that was due to additional load place on the snout of the crank due to the supercharger pulley. I am going to contact both CP and CMS today as I am pulling my motor soon to do the cam and add turbo drain bungs. Ill update with what I find out.

I wasn’t even thinking about the side load from that pully, just the hp draw. I wouldn’t be too surprised if the drop in rods and piston combo would live at 1200rwhp(dynojet) on a turbo set up.

Just spoke with Bryce@CP. The pistons and rods direct from them will support 1400+ fwhp. He informed me that with the upgraded rods (bullet H beam (HD)) 1800+ crank horsepower is possible. The rods are the weak(er) link link of the two. The pistons can support 1500+ as is. But I was assured that as standard bullet pistons and rods can support 1200whp!

Not sure of the capability of the stock crank. Going to call ARP about studs soon.

Can anyone find out from CP if this Rods-Pistons combo has the exact same bob weight as the stock Assy?
This could be a critical point.
You would not like to run an unbalanced motor at such power levels - actually at any power level...

They are. They are designed to lower compression ratio, but maintain the balance. When I spoke with Bryce we also about the weight difference with the upgraded HD rods. The upgraded rods are within 1% off the weight of the standard bullet rods. So they should also drop in.

Dyno arguments aside..... (I personally don't believe all mustang dynos read low...).

It seems that trapping 147+ full weight is the danger zone for the stock mains. Whatever HP math that comes out to be because that's where people are running into the issues.

I am guessing that is Procharger cars. What if you dump the belt and gain 140hp without the engine having an increased load(turbo). Using a hp et calc that 146 becomes 153 mph.

Sure haha. I hope my Maggie belt isnt eating 140hp.

I found a chart that says a f1r uses 140hp at 21psi. I think at 1000rwhp the 140hp is a pretty good estimate.

This is important news.
Would be good to verify the weight side-by-side to the OEM combo on a scale.

Word on the street is, that currently there is no aftermarket pistons/rods provider that is actually 100% on-spec Bob weight of the OEM material.

Here is the chart for a f1r drive hp. It seems like if a Procharger car can do 1000hp or 147mph a turbo car should be able to do 140hp better. Of course this just relates to the engine load. The rest of the driveline needs to be able to handle that extra power.

There is also the side load on the crank, at 1000hp I bet they have that belt pretty tight. Not sure how that effect the bearings.


https://www.dragzine.com/files/2012/02/f1r.jpg

CMS car had the F1A-94 and did 149mph at 800 DA full weight 1ss, 933whp (again not getting into this dyno/that dyno just stating what they said).

Pretty sure a F1A-94 is a smaller blower than an F1R by a LOT.

I dunno. I am aiming for mid 9's at mid 140's with the Maggie boost only so I am quite a ways off of these crazy monsters.