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by **Begle1** » Sun Oct 28, 2007 5:04 pm

It's pretty impossible to run the 15.3 ratio pistons without having lots of blue smoke all the time, right?

Has anybody ever ran them on a daily driver?

by **KTA** » Sun Oct 28, 2007 8:06 pm

Depends on your timing injectors and outside air temps. I have several 15.3 motor in daily drivers running around that don't smoke at all once warmed up.

by **ford69557ci** » Tue Oct 30, 2007 10:00 am

i hope the .060 head gasket i am goin to be runnin doesnt drop the compression to much. whats factory 17.5-1 18-1????

by **dpuckett** » Tue Oct 30, 2007 4:38 pm

Factory compression is 17.5:1. How thick is the stock H.G? I have the .020 over, and it starts fine if I let the grids warm up.

I'd think if you had the right injectors, timing, and air flow, you wouldnt smoke much, cold or warm. Lot of N14s are in the 14.5-16:1 range.

Heck, a 6.9 IDI with a 22:1 compression will smoke if the fuel system isnt up to snuff.

Daniel

by **ford69557ci** » Tue Oct 30, 2007 5:14 pm

yeah my nieghbors 6.9 idi looks like its on fire till it warms up for about an hour

by **KTA** » Wed Oct 31, 2007 6:51 am

A 0.060" gasket is about stock thickness.

by **92 D/UNIT** » Wed Oct 31, 2007 6:29 pm

ford69557ci wrote:yeah my nieghbors 6.9 idi looks like its on fire till it warms up for about an hour

now thats funny!

by **Begle1** » Thu Nov 08, 2007 7:49 pm

Should I expect a mileage drop with them?

What about starting troubles?

by **GPSMatt** » Thu Nov 08, 2007 9:16 pm

is it a bad idea to fly cut the stock ones? what's a good source for low comp pistons

by **GPSMatt** » Sun Nov 11, 2007 1:34 am

any input on my above post anybody?

by **GPSMatt** » Sun Nov 11, 2007 3:38 am

just found a post kta did in another section that the marine ones are15:3(?) and that they have a bigger bowl. What good does the bigger bowl do? well it burn more fuel better

by **therabbittree** » Mon Nov 12, 2007 8:50 pm

I have a set of marine pistons I've been saving to use in a build..I've been nervous about trying them, as I snowplow and drive my truck alot in real cold weather..not sure how they would be in 0 degree temps..any one know?
Thanks
Deo

by **KTA** » Mon Nov 12, 2007 9:40 pm

They would be fine with a good load, but not without. They also would not build as nuch heat. I would save them for more of a toy and leave the high comp pistons for snow plowing.

by **GPSMatt** » Tue Nov 13, 2007 3:07 am

anyone have a source for marine pistons URl?

by **KTA** » Tue Nov 13, 2007 8:43 am

I get my marine pistons from cummins.

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Low-compression pistons on the street?

Low-compression pistons on the street?

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