light pro engine January 16, 2010 05:01AM
Wanting to move up to the light pro class with a high rpm engine similar to what they run in Europe, At what rpms will aftermarket rods become necessary . Thinking about a blue one with 4.625 bore and 5.2 stroke. What size wrist pin would be adequate. Just how many rpms do they run in Europe, they sure sound like a lot on the videos
Reply Quote

Re: light pro engine January 17, 2010 01:37AM
We run 1.5" wrist pins in our billet rods on Snoopy.
That is with a billet CDS sigma and 4.5" turbo with intercooler.
We have practiced when oem hardened rods will fail , and that will happen at 6500rpm+
Ours went out at 7000+ rpm and it is basicly the rod lenght that is the problem , not the rod itself.
Last year we have had a transmission breakage and a engine that went up to 9000rpm
without kicking out anything , it was still running fine.(with billet rods 1" longer as STD)
So the 1.5' pins is big enough and are weightwise the best option.

Best regards

Edward Beukeveld / Snoopy prostock The Netherlands
Reply Quote

Re: light pro engine January 17, 2010 01:57AM
I have seen the Snoopy tractor run on youtube. It is awesome!
Reply Quote

Re: light pro engine January 17, 2010 10:59AM
Thanks Edward, Thats what I needed to know. At those rpms do you need to go anything to the crank ?
Reply Quote

Re: light pro engine January 17, 2010 06:20PM
The cranck was a big problem aswel , we had a 5.2 crack fully counterweighed but at high rpm
the welded on weights came loose.
Since 2008 we have a billet cranck which works out perfect.

Best regards

Edward
Reply Quote

Re: light pro engine January 18, 2010 12:57AM
Just curious why the longer rods are better. I would have thought the short rods would have held the high rpm's better.
Also why the counterwieghted crankshaft ? more torque??
Reply Quote

Re: light pro engine January 18, 2010 12:00PM
Too add to the questions. Building a 540 Light Pro to run NTPA. Will be using a 8.3 cummins. What would you all suggest for a final drive ratio?
Reply Quote

Newer Topic Older Topic

Author:

Your Email:


Subject:
Spam prevention:
Please, enter the code that you see below in the input field. This is for blocking bots that try to post this form automatically. If the code is hard to read, then just try to guess it right. If you enter the wrong code, a new image is created and you get another chance to enter it right.
Message:
Website Statistics
Global: Topics: 38,771, Posts: 229,938, Members: 3,338.
This forum: Topics: 37,096, Posts: 226,027.

Our newest member Jacklovik2009