Low compression Franken S2k motors?
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Joined: Apr 2006
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From: Reno Nevada
Originally Posted by solomonster,Nov 25 2009, 09:18 PM
soo what ended up being the total cost of the rebuild
used f20 crank= 150
New bearings, acl mains, stock rods=150
machine work=300
used f20 rods= 40
used f22 pistons/rings = 40
gasket kit= 100
used block with hone= 200
At this point the motor has around 200 miles on it, I was going to go for the full break in period without boost, but then I realized that if the pistons were going to give out, why waste the time breaking it in. So I took it out for some boost runs today
. I figured I would start it out at low boost, 12 psi and slowly move it up to 18 psi as the miles build on the motor. Today’s runs were all at 12-13 psi. Car feels real strong, my butt dyno says at least 400+ whp
The car spins the tires in first and second gear easily, with 18 inch reo50's. The tires never spun like that with my previous motor, and it dynoed at 369 whp, at higher boost than im running now. Of course I also upgraded from the stock clutch to a carbonetic single carbon so that may have something to do with the tire spin. In any case the only problem I ran into was that the car was throwing a p1129, which is a map sensor cel. I tried the map whack but no luck, I think its time for a new map sensor.
Joined: Mar 2003
Posts: 6,507
Likes: 51
From: Sellersburg, IN
Originally Posted by Artisan7471,Nov 27 2009, 09:00 PM
Total cost of the build was around $1000.
used f20 crank= 150
New bearings, acl mains, stock rods=150
machine work=300
used f20 rods= 40
used f22 pistons/rings = 40
gasket kit= 100
used block with hone= 200
At this point the motor has around 200 miles on it, I was going to go for the full break in period without boost, but then I realized that if the pistons were going to give out, why waste the time breaking it in. So I took it out for some boost runs today . I figured I would start it out at low boost, 12 psi and slowly move it up to 18 psi as the miles build on the motor. Today’s runs were all at 12-13 psi.
Car feels real strong, my butt dyno says at least 400+ whp
The car spins the tires in first and second gear easily, with 18 inch reo50's. The tires never spun like that with my previous motor, and it dynoed at 369 whp, at higher boost than im running now. Of course I also upgraded from the stock clutch to a carbonetic single carbon so that may have something to do with the tire spin. In any case the only problem I ran into was that the car was throwing a p1129, which is a map sensor cel. I tried the map whack but no luck, I think its time for a new map sensor.
used f20 crank= 150
New bearings, acl mains, stock rods=150
machine work=300
used f20 rods= 40
used f22 pistons/rings = 40
gasket kit= 100
used block with hone= 200
At this point the motor has around 200 miles on it, I was going to go for the full break in period without boost, but then I realized that if the pistons were going to give out, why waste the time breaking it in. So I took it out for some boost runs today
. I figured I would start it out at low boost, 12 psi and slowly move it up to 18 psi as the miles build on the motor. Today’s runs were all at 12-13 psi. Car feels real strong, my butt dyno says at least 400+ whp
The car spins the tires in first and second gear easily, with 18 inch reo50's. The tires never spun like that with my previous motor, and it dynoed at 369 whp, at higher boost than im running now. Of course I also upgraded from the stock clutch to a carbonetic single carbon so that may have something to do with the tire spin. In any case the only problem I ran into was that the car was throwing a p1129, which is a map sensor cel. I tried the map whack but no luck, I think its time for a new map sensor.
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Joined: Apr 2006
Posts: 825
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From: Reno Nevada
Originally Posted by Soul Coughing,Nov 28 2009, 09:42 AM
wouldnt you be having map issues as the stock map only registers 10-12 pounds of boost?
Dsddcd I dont have the exact specs, but I think you should be around 10:1 if you machine off the domes. I will double check when I get home.
Ian3000d, if you are going to machine the domes of the piston, it really dosent matter what piston you use. After machining the only difference between the pistons is where the oiling holes. are.
