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318 Crank??? #196342 01/17/09 06:49 PM 01/17/09 06:49 PM
A Anonymous OP Unregistered
Anonymous OP Unregistered A	Is there any way to tell by looking at a 318 crank if it's cast or forged. Because a 340 and 318 have the same crank correct. Thanks

Re: 318 Crank??? #196343 01/17/09 08:09 PM 01/17/09 08:09 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Quote: Because a 340 and 318 have the same crank correct. Not hardly. 340 and 318 might share the same main bearing size and stroke, but the cranks are not the same. As for the original question, yes there is a way to tell the difference by looking. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 318 Crank??? [Re: Supercuda] #196344 01/17/09 08:37 PM 01/17/09 08:37 PM
Joined: Jan 2003 Posts: 6,433 Abilene, Texas F fastmark master
fastmark master F Joined: Jan 2003 Posts: 6,433 Abilene, Texas	Steel cranks have bigger parting lines where they are forged together. Cast have small ones and have casting clocks and some numbers cast into them. A steel 318 (and 273) crank does not have a hole through the rod journal end and a 340 does have a hole. The 273 and the 318 steel are the same crank. They get the right balance by using a real heavy piston pin in the 273.

Re: 318 Crank??? [Re: fastmark] #196345 01/17/09 09:35 PM 01/17/09 09:35 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: The 273 and the 318 steel are the same crank. They get the right balance by using a real heavy piston pin in the 273. What is different on the 273 that it needs the heavy piston pin to balance out? live every 24 hour block of time like it's your last day on earth

Re: 318 Crank??? [Re: RapidRobert] #196346 01/17/09 09:43 PM 01/17/09 09:43 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	There have been many 318 shafts used in 340's. Many without rebalancing and gotten away with it, but they SHOULD be rebalanced for 340 use to be right.

Re: 318 Crank??? [Re: MoparforLife] #196347 01/17/09 11:43 PM 01/17/09 11:43 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	I am building a 273(from scratch) & I'm wondering if there's a balance issue that is going to bite me in the tail later. I have a 318 crank/rods that I can use(dont know what year though, might be 80's). When you mentioned "extra heavy pin" that worried me live every 24 hour block of time like it's your last day on earth

Re: 318 Crank??? #196348 01/18/09 12:01 AM 01/18/09 12:01 AM
Joined: Jan 2008 Posts: 2,275 ILLINOIS V volaredon top fuel
volaredon top fuel V Joined: Jan 2008 Posts: 2,275 ILLINOIS	where are you located? Is a steel crank absolutely necessary in your build? I have 2 fresh, cast 318 cranks here.

Re: 318 Crank??? [Re: fastmark] #196349 01/18/09 12:20 AM 01/18/09 12:20 AM
Joined: Aug 2003 Posts: 4,384 Madison Wi NTOLERANCE master
NTOLERANCE master Joined: Aug 2003 Posts: 4,384 Madison Wi	Quote: A steel 318 (and 273) crank does not have a hole through the rod journal end and a 340 does have a hole. Poly 318 engines used steel cranks with no holes in the rod journals. Crank is a pretty stout piece. I used to care but....... things have changed

Re: 318 Crank??? [Re: RapidRobert] #196350 01/19/09 09:33 AM 01/19/09 09:33 AM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	Quote: Quote: The 273 and the 318 steel are the same crank. They get the right balance by using a real heavy piston pin in the 273. What is different on the 273 that it needs the heavy piston pin to balance out? uh, the pistons are much smaller in diameter, so they're lighter.... btw, somewhere in the early to mid 70's, they started using they commonized rods and started using the 340/360 rods in 318's, so an 80's 318 will have heavier rods than a 273/late 60's 318 Last edited by patrick; 01/19/09 09:35 AM. 1976 Spinnaker White Plymouth Duster, /6 A833OD 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)

Re: 318 Crank??? [Re: patrick] #196351 01/19/09 11:53 AM 01/19/09 11:53 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: What is different on the 273 that it needs the heavy piston pin to balance out? uh, the pistons are much smaller in diameter, so they're lighter.... Alright so they just used a heavier pin so they wouldn't have to rebalance that particular combination. I got it. It didn't make sense at first because using a heavier anything is the oppposite of what we normally want to do especially a pin because they dont break & you certainly wouldn't want to add to the reciprocating weight . thank you Patrick. live every 24 hour block of time like it's your last day on earth

Re: 318 Crank??? [Re: RapidRobert] #196352 01/19/09 10:10 PM 01/19/09 10:10 PM
Joined: Jan 2003 Posts: 6,433 Abilene, Texas F fastmark master
fastmark master F Joined: Jan 2003 Posts: 6,433 Abilene, Texas	Sorry I did not check back but the reason is the lighter pistons. You ought to see the pin. It looks like it may have a .250 hole in the middle. It is heavy.

Re: 318 Crank??? [Re: fastmark] #196353 01/20/09 12:58 AM 01/20/09 12:58 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: Sorry I did not check back but the reason is the lighter pistons. You ought to see the pin. It looks like it may have a .250 hole in the middle. It is heavy. Fastmark Since I would be rebalancing can a person use another SB pin(like a 318 one for instance) in these 273 pistons? live every 24 hour block of time like it's your last day on earth

Re: 318 Crank??? [Re: RapidRobert] #196354 01/20/09 01:56 AM 01/20/09 01:56 AM
Joined: Jan 2005 Posts: 12,423 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,423 Kalispell Mt.	I am not Fast mark but yes it would be a good idea I am not causing global warming, I am just trying to hold off a impending Ice Age!

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