Wow, I learn something new everyday. I had no idea that an "I" beam could be as strong as an "H" beam rod. Thanks for the info.

 

Very weird. I've taken mechanics, physics, strength of materials, and about a million other engineering classes, and can't understand how an I could be stronger than an H?

 

The H beam rods will handle well over 750 HP and 850 FTLBS of torque continuously. If we need more we will go to an h beam rod made out of a 300M material. The difference in H and I is really just the way they will twist. The I beam is not a stronger rod. When the I beam twists from too much power or torque it just does it in a different direction that the H beam. The I beam twist front to back and the H beam twists side to side. In the old days the engine builders would use I beam rods, so that when they pulled the cylinder heads off they could see if the rod was bent, they could tell that by the scuffing of the cylinder walls. Where as with the H beam you cant. H beam rods are used in all the factory hot rods. The material the Rods are made out of now a days is just so much better there is no need to chose one or the other. We prefer the H beam. But we can do a custom shortblock with I beams If anyone like, just not at this advertised price.

ie The Ford GT pushing over 600 engine crank HP and they pass fords durability test.

JimIII

 

The rods you stated you are using utilizing 4340 steel are only rated at 700hp using 3/8's ARP bolts. They are not tq rated nor is any other connecting rod.

Also, and I beam rod from Manley in their pro series with 7/16 ARP bolts is rated at 1200hp.
Thats not to say that what you are using in your regular engines wont handle more power just make sure that you tell your paying customers exactly what they bought. also the 300m rod is an I beam.

Adrenalinowner

 

JJ,...I mean Adrenalineowner

I did tell them exactly what they are buying in my first post. Our engines, their components, and durability levels speak volumes themselves

300M is the material a rod can be made out of, Manley can get these pieces custom for us and its already been done.

JimIII

 

Priceless!

 

Mihovetz and SHM are the reasons why you can get the rods you do, nowadays they are not spec'd by anyone including jdm psp jl or anyone else they all come from manleys stock and in different power ratings. SHM and Mihovetz pioneered the rods way back in 96. Remember Steve A from columbus ohio? he gave you his complete address and everything yet you still claimed it to be jj. i guess once someone goes against the grain and doesnt believe or proves wrong what comes out of the jdm camp, you blame that poor guy everytime. been around alot longer than you kid and the best thing you have done is keep the old man off the net. good to see you finally doing 9:1 motors, others have been doing it for alot longer as a matter of fact there is one in florida kicking everyones butt and it didnt come from you guys. thats right you dont like florida.

Adrenalinowner

 

okay you had your piece now Id like to have this get back to the original intent of the thread. Holiday special!

JimIII

 

JDM found a newer way to HP? Mustang guy's have been doing this for year's, higher compression and less boost!
I find it hard to believe that Manley wouldn't sell a superior product to the public?? Only JDM can have these superior rod's???
Give me a break!!! Not on my rod's, which are Manley's!!
Merry X-Mas.
Bryan

 

I am confused what are you saying here. The 300M rods have been made for alot of people for alot of years. Manley sells the rods, and they themselves do not make them. Your opening statement "JDM found a new way to make HP?" We have always made good HP, we are just offering more HP to the people who would want to run lower boost. We offer our engines in 9:1 comp, 9:5 comp, 10:1 comp, and 12:1 comp. We have had all these combos out there running for years. Example Paul Gaminos F150 is a 5.4 4v NA motor running 12:1 that we built. We have done testing with 9:1 and 9.5:1 in the Lightning truck. We test these things for months before we even make a decision on if we are going to offer it.

Our Aluminum 4V versions are 10:1, I will answer any and all questions you need to know about our shortblocks.

Jim@JDM

 

Well back to the thread.......Thank you for my Holiday Special, and I will let you know how it works out...............So hard to keep a thread on topic

 

I apologize for taking your thread off topic.
Bryan

 

 

Have you worked out the development of all your machining tolerances in the past couple of years? I've only ever seen 2 JDM Motors. The first one was probably over 2 years ago and had the worst piston slap you could possible imagine until it warmed up, and ended up having to get reworked at the customers expense (I don't remember what happened to it). But the second one I know of built in the past year doesn't have the piston slap.

My question is should someone expect piston slap (on a cold motor) from one of your latest motors or have you solved this?

 

JDM can answer this a lot better, but I believe in the wee beginning of their motor program they used those Manley pistons where the design of the skirt made the motor more prone to the piston slap noise.

They have changed the piston design a long time ago and I haven't heard a JDM motor make any kind of piston slap noise in years.

Like I said Jim could probally give you a more thorough response.