253 Crank in 308? Options

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JBM		#1 Posted : Saturday, 25 October 2008 7:31:21 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 28/03/2006(UTC) Posts: 810 Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		Is it possible to run a 253 crank in 308 bore with light weight pistons? If its possible what pistons can be used. James You only have to be in front at the end of the race.
		You only have to be in front at the end of the race.
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HK1837		#2 Posted : Saturday, 25 October 2008 7:47:15 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 556 time(s) in 531 post(s)		Yes its possible, but there would be no benefit I could see as itd cost you heaps more adding weight to try to balance it. Youd be better off starting with a 308 crank and removing weight. _______________________________________________________ If we
		_______________________________________________________ If we all had the same (good) taste, who would buy all the Fords?
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JBM		#3 Posted : Saturday, 25 October 2008 7:50:49 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 28/03/2006(UTC) Posts: 810 Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		If the 4" pistons weighed the same as a stock 253 piston no extra weight would need to be added,yes? James You only have to be in front at the end of the race.
		You only have to be in front at the end of the race.
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jim		#4 Posted : Saturday, 25 October 2008 8:50:41 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 28/03/2008(UTC) Posts: 1,903		I guess so but youll still have to balance it all,the last thing you want is to start it and hear that rumble before it lets go.There is no use doin this in my opinion as the bore/stroke relationship will suffer,as i said my opinion...cheers Jim in ade
		Jim in Adelaide..
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JBM		#5 Posted : Saturday, 25 October 2008 8:57:33 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 28/03/2006(UTC) Posts: 810 Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		The 253 and 308 have the same stroke. I just thought it would be an easy way to use light pistons in Holden V8 with a 4" bore. James You only have to be in front at the end of the race.
		You only have to be in front at the end of the race.
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coopers308		#6 Posted : Saturday, 25 October 2008 11:06:46 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 26/07/2008(UTC) Posts: 36		Same stroke? 253 is 3.062 and 308 is 3.480. Counterweights are different and the cost of these ultra light pistons wouldnt be worth even trying.
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Guest		#7 Posted : Saturday, 25 October 2008 1:20:57 PM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		253 and 308 are the same stroke just different bore size, yes if you are using a lighter piston with the 253 crank in a 308 it does work engine builders have been doing it fdor years

HK1837		#8 Posted : Saturday, 25 October 2008 6:55:05 PM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 556 time(s) in 531 post(s)		3.48" stroke in a 308 is a 350. _______________________________________________________ If we all had the same (good) taste, who would buy all the Fords?
		_______________________________________________________ If we all had the same (good) taste, who would buy all the Fords?
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jim		#9 Posted : Saturday, 25 October 2008 10:11:35 PM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 28/03/2008(UTC) Posts: 1,903		If this was done I think you would lose some torque I still think there are better ways IE;308 slight cam,solid lifters(for revability)and that would give you torque and revs..Is that what your after? the price would be cheaper i think and easier to build
		Jim in Adelaide..
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Guest		#10 Posted : Monday, 27 October 2008 8:14:27 PM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		there is a hot LJ running around here with a 253 crank in a 308 block. the balancing guy said it really hard to balance and was charged for the time it took. and it revs like a 308 with a alloy flywheel. really bad torque and you can just back off the thr

JBM		#11 Posted : Tuesday, 28 October 2008 4:38:34 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 28/03/2006(UTC) Posts: 810 Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		I have a complete VB Red 253 in bits and the opprotunity to buy a 308 short motor. I currently have a blue 253 VH that needs welch plugs and a good clean up. I can either build a mild 253 from the one in bits and swap them over or go wild with a 253 Edited by user Tuesday, 28 October 2008 4:48:53 AM(UTC)  | Reason: Not specified
		You only have to be in front at the end of the race.
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Guest		#12 Posted : Wednesday, 29 October 2008 6:27:44 AM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		How much weight would you really be saving?.... I would think in the end it would be money spent better els were in the rebuild. A lighter crank with off set ground journals is counter productive in making power. Playing around with internals from one si

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