250 rebuild info
- Thread starter CougarT
- Start date
: Have we lost the 2.3, 2.5, rod, piston, deck height info thread for the 250 rebuild?
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Anonymous
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Anonymous
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http://fordsix.com/forum/viewtopic.php?t=5215
Hey X.
I've been researching Buick 3.3L pistons, to use with a longer rod for my 250CI build up. What do you think, am I outta my mind? I am an Aquarius just like you so some of my ideas may just be inline(pun) with yours.
V6 204, 3.3L
Bore: 3.700(IN), 94(MM)
2.83" dia. head recess .123" deep.
APPROXIMATE HEAD VOLUME=11cc
Comp. Ht. 1.310
Pin Diameter .9054
DB
Hey X.
I've been researching Buick 3.3L pistons, to use with a longer rod for my 250CI build up. What do you think, am I outta my mind? I am an Aquarius just like you so some of my ideas may just be inline(pun) with yours.
V6 204, 3.3L
Bore: 3.700(IN), 94(MM)
2.83" dia. head recess .123" deep.
APPROXIMATE HEAD VOLUME=11cc
Comp. Ht. 1.310
Pin Diameter .9054
DB
Looks great to me. What year was that? If it was an even fire engine, you may have to centre the rod by machining. If its odd fire, the rods are centred as they come. All I remember was the the little 1982 Buick 3000 cc (an ultra short stroke 3800), and I thought the GM 3800 had a GM 3300 cousin, but I was sure it was 3.8" bore.
Details indicate that you may need a set of 6.2" 300 Ford con-rods with a bush to suit the smaller Bjork wrist pin. In a 250 block, with the best rods around, a strong, light piston, it could be pretty good. The 12.7 cc trench lookes okay to me too. As long as it is able to handle the piston speed.
If the 3.3 Buick engine had 3.1" stroke, at 6000 rpm, the maximum piston speed is only 3100 feet per second. On a 250, it would be limited to about *** :arrow: 2500 feet per second, or 4800 rpm.If the piston can hack say, 7000 rpm on a 3.3 Buick, then it would be okay to 5500 rpm on the 250.
(Longer stroke means you need pistons that can cope with high piston speeds. The 4-cyl 2.3 and 2.5 engines go right up to the 6000 rpm mark, under much more vibration and stress).
***Woops. Goofed me figures. 4800 rpm is in fact 3100 feet per second. Well, duh!
Details indicate that you may need a set of 6.2" 300 Ford con-rods with a bush to suit the smaller Bjork wrist pin. In a 250 block, with the best rods around, a strong, light piston, it could be pretty good. The 12.7 cc trench lookes okay to me too. As long as it is able to handle the piston speed.
If the 3.3 Buick engine had 3.1" stroke, at 6000 rpm, the maximum piston speed is only 3100 feet per second. On a 250, it would be limited to about *** :arrow: 2500 feet per second, or 4800 rpm.If the piston can hack say, 7000 rpm on a 3.3 Buick, then it would be okay to 5500 rpm on the 250.
(Longer stroke means you need pistons that can cope with high piston speeds. The 4-cyl 2.3 and 2.5 engines go right up to the 6000 rpm mark, under much more vibration and stress).
***Woops. Goofed me figures. 4800 rpm is in fact 3100 feet per second. Well, duh!
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Anonymous
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xecute":diz9ycb1 said:
1989-93 Buick, Olds and Chevy 3.3(204 CI.) motors. Don't know if it was an even fire or odd fire. I was just cruising kb-silvolite parts list and found this info. I thought this could be a good low compression substitute for the turbo/supercharger guys. I'll dig into it and hopefully find some more information.
By the way, I've decided to go with the 2.5 HSC rods and stock type TRW forged pistons for the 250 build up. Thanks for the info.
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