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4690 VS 2590 Pistons


 
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Russ970ont
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PostPosted: Fri Apr 30, 2021 3:31 pm    Post subject: 4690 VS 2590 Pistons Reply to specific post Reply with quote

What is the difference between the 504 intercooled engine pistons and the non intercooled pistons? Parts website lists them as different part numbers. According to the service manual, the intercooled engines have a 4 hole injector, but it has the same spray angle. Makes me think the bowls are the same. Intercooling a 2590 and looking to run the larger 4 hole injectors, already bought the non intercooled engine piston kit and am wanting to make sure the injectors will match the bowls correctly. Looking for some insight. Thank you.
 
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Roger Link
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PostPosted: Sat May 01, 2021 11:02 am    Post subject: Re: 4690 VS 2590 Pistons Reply to specific post Reply with quote

The 2670 used a forged piston rather than cast aluminum, the injectors have 4 larger holes that have more spray area than the 2590 5 hole injector,it will run fine but watch your exhaust temp as the forged piston will take more heat
 
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Russ970ont
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PostPosted: Sat May 01, 2021 2:27 pm    Post subject: Re: 4690 VS 2590 Pistons Reply to specific post Reply with quote

I wonder if the new aftermarket rebuild kits supply a forged piston? Reliance power parts lists the intercooled pistons to have a dual ni resist insert, probably a little better for longevity. Intercooling it, new better turbo, and cleaned up the exhaust ports, hoping egts arent an issue. 3 row harvester with corn processor eating up a lot of power. Thanks for the knowledge.
 
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Nedd
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PostPosted: Sat May 01, 2021 7:18 pm    Post subject: Re: 4690 VS 2590 Pistons Reply to specific post Reply with quote

Pretty sure wrist pin on 4690 piston is bigger. Would have to get 4690 rods to make it work
 
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Roger Link
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PostPosted: Mon May 03, 2021 12:38 pm    Post subject: Re: 4690 VS 2590 Pistons Reply to specific post Reply with quote

Wrist pins are the same size,1.800''
 
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