BC 272 Cams with stock rods and pistons?

[JDMMA70]

Im planning a rebuild for a 91 shortblock Im picking up soon and was wondering if 272 cams will be ok with stock pistons and rods. Im only going for 490-520HP but I wanted to keep the valves open longer. My ideal goal is to be able to rev the motor to at least 7200rpms. I will upgrade the valve springs as well, and go with 1mm oversized valves. However will this be all safe with reconditioned parts? Is there anything more I can do to prep the motor for this?


Thanks
~JDMMA70

[a_sesshoumaru]

if you get the 500hp, you will be pushing the limits of a stock bottom end, if you are going to spend that money save for a set of eagle rods and probe pistons and go the safe way.

[QWIKSTRIKE]

if you get the 500hp, you will be pushing the limits of a stock bottom end, if you are going to spend that money save for a set of eagle rods and probe pistons and go the safe way.

People have gone to 700rwhp on stock rods. Safety insurance is in Eagle rods or better. It's ultimately in the tune.

[X-man]

if you get the 500hp, you will be pushing the limits of a stock bottom end, if you are going to spend that money save for a set of eagle rods and probe pistons and go the safe way.

Yeah, you have to be careful with the stock bottom end. After all it's pretty weak.

[White Zombie]

So your not asking if the cams go with the rods an pistons. You want to know if the rods/pistions can handle 500 hp.? I believe thats an insurance call. Im only shooting for 400 ish and I bought Probe pistions and eagle rods. Whats the WORST that could happen If I decide to Add more power. I Wont have to go into the motor a Second time .

[QWIKSTRIKE]

Yeah, you have to be careful with the stock bottom end. After all it's pretty weak.

lol......I think you beat SEB AU's dyno didn't you.lol:naughty:

[QWIKSTRIKE]

So your not asking if the cams go with the rods an pistons. You want to know if the rods/pistions can handle 500 hp.? I believe thats an insurance call. Im only shooting for 400 ish and I bought Probe pistions and eagle rods. Whats the WORST that could happen If I decide to Add more power. I Wont have to go into the motor a Second time .

The ultimate reason to do this is in case you want to really crank the power over 600-700rwhp. See X-mans sig.DOH

[JDMMA70]

alright thanks for the advice ill upgrade rods and pistons and have the rotating assembly balanced. thanks again

~jdmma70

[92nsx]

alright thanks for the advice ill upgrade rods and pistons and have the rotating assembly balanced. thanks again

~jdmma70


If you got .040 over, and do what you are planning on to the head, you are going to hava carbon copy of my entire block/head. (Minus the driftmotion oil tube) LOL

[frontierguy25]

I guess you guys missed the inside joke that Xman had. He put down over 700rwhp on the stock bottom end and head. The only thing that he had was a HKS HG with ARP's. Like they said before, it's all about the tune of the car. Xman had his car running with over 500rwhp for a long time and made many passes at the strip and dyno.

[QWIKSTRIKE]

I guess you guys missed the inside joke that Xman had. He put down over 700rwhp on the stock bottom end and head. The only thing that he had was a HKS HG with ARP's. Like they said before, it's all about the tune of the car. Xman had his car running with over 500rwhp for a long time and made many passes at the strip and dyno.

Not I......I just can't remember if he broke seb AU's stock bottom end record.

[joliroger4]

As far as I am concerned the limit of the stock short block has yet to be found. X-man is making ridiculous power. My ebay piston'd motor I built 4 years ago is still kicking and I can't even begin to tell you what that thing has gone through. The compression on it is 167-170 on every cylinder as of two weekends ago. HKS or greddy gasket and arp studs should be the only aftermarket parts needed in your rebuild. If your motor blew up you did something wrong in the rebuild or the management end of things.

[X-man]

As far as I am concerned the limit of the stock short block has yet to be found. X-man is making ridiculous power. My ebay piston'd motor I built 4 years ago is still kicking and I can't even begin to tell you what that thing has gone through. The compression on it is 167-170 on every cylinder as of two weekends ago. HKS or greddy gasket and arp studs should be the only aftermarket parts needed in your rebuild. If your motor blew up you did something wrong in the rebuild or the management end of things.


Might see if we can't up the limits even more this weekend.

Sean

[QWIKSTRIKE]

As far as I am concerned the limit of the stock short block has yet to be found. X-man is making ridiculous power. My ebay piston'd motor I built 4 years ago is still kicking and I can't even begin to tell you what that thing has gone through. The compression on it is 167-170 on every cylinder as of two weekends ago. HKS or greddy gasket and arp studs should be the only aftermarket parts needed in your rebuild. If your motor blew up you did something wrong in the rebuild or the management end of things.


I agree on this whole heartedly Dave.

[figgie]

You mean to tell me that the majority of the issues with the 7m has been user induced? But it CAN'T BE. The 7m is a craptacular BHG proned motor!!! ;)

[Suprafast0422]

I know arp studs are a must with a mhg, but are arp main and rod bolts worthit when running on a stock bottom end?

[Quin]

No. New, properly torqued Toyota stuff will hold up just fine.

[QWIKSTRIKE]

No. New, properly torqued Toyota stuff will hold up just fine.

Not if its assembled or tuned wrong.....

[gaboonviper85]

Not if its assembled or tuned wrong.....

...so if you use arp hardware then it doesn't matter if you tune or assemble wrong....Fail

[QWIKSTRIKE]

...so if you use arp hardware then it doesn't matter if you tune or assemble wrong....Fail

Thats correct....poor assembly or piss poor tuning will staill brihg her down to her knees.;)

You need to scrap thse low budget piggy backs and get a real after arket ecu and have it tuned properly.

[gaboonviper85]

Thats correct....poor assembly or piss poor tuning will staill brihg her down to her knees.;)

You need to scrap thse low budget piggy backs and get a real after arket ecu and have it tuned properly.

don't really agree with that....if your not after huge power than a piggy will get you your 350hp just fine and keep your motor running effeciently! Piggybacks have a purpose and they do a damn good job for what they are...

Stock hardware is good stuff...arp is better but stock is more than able to take abuse...

[QWIKSTRIKE]

don't really agree with that....if your not after huge power than a piggy will get you your 350hp just fine and keep your motor running effeciently! Piggybacks have a purpose and they do a damn good job for what they are...

Stock hardware is good stuff...arp is better but stock is more than able to take abuse...


rod berings knock because......piss poor tuning will bring it down dude. Detonation is the enemy of and built engine perio

[Nick M]

Supracentral posted a link to the stock hardware. The testing was done by Reg Reimer on the headbolts I think.

They are just fine. As strong as the JZ series in fact.

[buldozr]

I would like to disagree with 'crappy' piggy back statement...

http://www.3si.org/forum/f142/dynoed-my-car-again-today-1093hp-436542/

1093hp on an arc II and an SAFCII, for people unfamiliar with an arcII, it was invented in the mid '90s for fuel correction, it has knobs (no digital readout) for tuning... Please be aware this is AWHP.

[buldozr]

ultimately, its not the toys, its the tuner.