Max HP on cast 318 crank?
#80761
06/28/08 12:38 AM
06/28/08 12:38 AM
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Joined: Jan 2003
Posts: 3,122
Auburn WA
Dave_J
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,122
Auburn WA
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Got a 318. Have KB pistons that are lighter than stock. Also have Eagle SIR rods that are lighter. All together 1 whole piston,pin,keeper and rod weigh 237 grams less than the TRW 318 piston, pin and rod. This will be rebalenced with the cranks counterweight being lighted to match. So what is the safe limit for a cast crank? And humor me, I dont want a 340 or 360, a teen is a very good engine. DaveJ
Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
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Re: Max HP on cast 318 crank?
[Re: 71valiant]
#80764
06/28/08 09:23 AM
06/28/08 09:23 AM
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Joined: Apr 2007
Posts: 1,261
ILL
mark7171
pro stock
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pro stock
Joined: Apr 2007
Posts: 1,261
ILL
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i think your right. my 318 advertises a forged crank too, but also 9.0:1 compression.
max hp 400
max rpm 6300
Last edited by mark7171; 06/28/08 09:24 AM.
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Re: Max HP on cast 318 crank?
[Re: 71valiant]
#80765
06/28/08 09:28 AM
06/28/08 09:28 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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late 60's the 318 switched from forged to cast.
numerous guys running 550-600 HP w/cast 360 cranks, (think of the number of W2 headed 360's that have run over the years) the 318 has similar if not more journal overlap, so I'd say it should handle similar power levels.
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1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Max HP on cast 318 crank?
[Re: ScottSmith_Harms]
#80770
06/28/08 07:46 PM
06/28/08 07:46 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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you might go to www.moparchat.com & scroll down to & click on circle track chat & check out Sanborns oiling mods that are in a sticky at the top.
live every 24 hour block of time like it's your last day on earth
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Re: Max HP on cast 318 crank?
[Re: RapidRobert]
#80771
06/28/08 09:07 PM
06/28/08 09:07 PM
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Joined: Apr 2007
Posts: 2,327
Glendale, AZ
69L78Nova
Banned. Forever.
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Banned. Forever.
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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Ive been running 7800 RPM on my stock 360 crank for 8 years. Its a standard crank, Eagle H-beam rods, KB pistons, and the bottom end balanced. I recently pulled the motor apart to change the pistons when I added the Eddy heads, and inspected the bearings. They looked brand new. Plastigaged right on, and 80 psi cold, 55 hot at idle.
1969 Nova
454/M21/3.31
Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)
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Re: Max HP on cast 318 crank?
[Re: patrick]
#80772
06/28/08 09:16 PM
06/28/08 09:16 PM
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Joined: Dec 2003
Posts: 8,964
Pizza Bucket
snuggles
master
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master
Joined: Dec 2003
Posts: 8,964
Pizza Bucket
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Quote:
late 60's the 318 switched from forged to cast.
I was thinking 71 was the last year for a forged crank in a 318
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Re: Max HP on cast 318 crank?
[Re: GoDartGo]
#80775
06/28/08 11:28 PM
06/28/08 11:28 PM
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Joined: Apr 2007
Posts: 2,826
NY usa
540challenger
master
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master
Joined: Apr 2007
Posts: 2,826
NY usa
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Quote:
why not use a 273 forged crank? they are already
set up for a lighter piston.
FOr a stick car the 273 crank is a good choice but if you have an auto cart the torque convertor hole is smaller then later la engines.
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Re: Max HP on cast 318 crank?
[Re: GoDartGo]
#80776
06/28/08 11:59 PM
06/28/08 11:59 PM
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Joined: Jan 2003
Posts: 3,122
Auburn WA
Dave_J
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,122
Auburn WA
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Quote:
why not use a 273 forged crank? they are already
set up for a lighter piston.
I have a 273 forged crank but they are not set up for light pistons. The small 273 piston is light but the piston pin is a huge hunk of steel. Ma Mopar used a Poly 318 crank to build the 273 but dident want to have to spend $$$ to rebalence it so they added weigh to the piston by making the pin so heavy, to equal a Poly 318's piston weight.
The block is a 78. Eagle SIR rods, not stock. We have done the drilling of the oil passages out, 1/2 inch for all the big ones to include the #5 main and oil pump, and 9/32 for the small ones from the mains to the lifter galery only. Will use a 8 qt pan with only 5 qts. Oil filter adapter PLATE has 4 more holes drilled inbetween. Windage tray with a small oil scraper. Oil cooler with 10 inch fan. Many more mods too. We were figuring around 450 HP. DaveJ
Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
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