Engine and Transmission Tech
tips, technology, tools and techniques related to vehicle driveline components
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Re: Coscast blocks
Did I hear 'long sleeves'. Nic and I were bench racing a stroked engine using a Buick 340/350 crank. Nic concluded that the long stroke would pull the piston out of the bottom of the cylinder. Perhaps this long sleeve is a potential solution.
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castlesid Kevin Jackson Sidcup UK (361 posts) Registered: 11/18/2007 10:38AM Main British Car: 1975 MGB GT Rover V8 4.35L |
Re: Coscast blocks
Guys,
From what i've read even a 3.4" stroker crank needs some relieving of the block, anything larger is going to need careful consideration. To use longer liners you would have to remove the registers at the bottom of the bore and then there would be nothing to seal against, you may also run into problems with cam and rod interference. Kevin |
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NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: Coscast blocks
I think you can get away with it if the liners are flanged. Are those longer ones not flanged..? I wasn't paying close enough attention.
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castlesid Kevin Jackson Sidcup UK (361 posts) Registered: 11/18/2007 10:38AM Main British Car: 1975 MGB GT Rover V8 4.35L |
Re: Coscast blocks
Nic,
Yes you can flanged in the longer lengths. Would it not be better to re-liner with the 96mm bore size and gain capacity that way, with the 86.36 crank you get 5000cc. without the problems associated with an excessively long stroke. Probably won't want to rev much over 5500 RPM though. Kevin. |
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Coscast blocks
Ok, What kind of vehicle are you guy's building that will "need" a 3.85" stroke? Anyone calked the "I" loads at red-line? Sports cars kind of like "enough" torque and free reving. I mite be off here but I don,t see this with a 3.85" cast crank, with a short rod ratio, day-in-out vs. say drags? Just 2 cents, roverman.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6469 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Coscast blocks
Dunno Art, I'll give you my reactions when the 340 goes online. It has the 3.85 stroke and a 1.8 rod ratio, total piston weight of 579.7 grams and total rod weight of 606.1 grams split 447.1/159 all parts in. I won't know for sure until she fires off but I think it'll wind out allright. Shooting for a 7 grand redline. Hope you don't mind waiting 'til spring/summer.
Jim |
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Coscast blocks
Jim, yes the benefit of a much taller deck. With your build, it sounds like the biggest problem be buying rear tires? Me thinks you want ,"Badass" to respect lil' brother? I shouldn't even be,"Yakin" this stuff. I'm sposed' to concentrate on project,Rotus Blossom".roverman.
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NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: Coscast blocks
Whoa, 3.85? We're talking 3.95! (The 360 Buick 300) It's not about needing it. It's true I don't NEED it, especially for my current application. BTW speaking of application, my Vega's hatch decided to try to take my thumb off this morning. SUPER irritating, and it hurts like a mthrFkr!!!
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6469 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Coscast blocks
Need? Who said anything about need? Now want, that's a whole nother thing. Art, I hope you get your Rotus Blossum built. Nic, what are you going to do with your 300 once the 360 is built? And yes, I would like to be able to keep up with the Roadmaster, but I have a feeling it ain't gonna happen.
Jim |
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MGBV8 Carl Floyd Kingsport, TN (4512 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Coscast blocks
Quote: I'm right there with ya on that line of thinking, Art. Exactly why I like the short stroke baby Buick/Rover. I'm gonna build a 3.9, be happy, & run the piss outta my MGB sports car (not a muscle car). |
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Coscast blocks
Carl and all, I must apologize that,"Rotus Blossum", stroke be somewhere in middle at 3.3". Yes-true that's .5 over yours but "measly" .65" under Nic's, proposed, "Tractor Pull" motor. Lest anyone be torked out of shape, I'm anticipating, "usable" sports- car- like torque, thru the range. May we all be "scholarly" at Diversity University.roverman.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6469 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Coscast blocks
"Horsepower sells cars, Torque wins races"
Honestly, if it'd plant the tires and hoist the fronts off the ground that'd be just about enough. Those mountain passing zones would be gettin' real short. Jim |
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NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: Coscast blocks
I gotdo admit I'm a big fan of the short stroke motor too. I love the puzzle of trying to figure out the oddball engine though. I'm fascinated by it. If it turns out that the 360 is my next engine I have no idea what I'll put it in.
On that note I was a bit of a fan of the 4.0 stroke on the Rotus engine mostly because of the wicked 2.1ish rod ratio for big RPMs. Dude, "Rotus Blossom" IS a totally bitchin' name. LOL! I love it. |
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6469 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Coscast blocks
Dude, that'd take an 8.4" rod!
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NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: Coscast blocks
LOL. I meant 4.0L Rover stroke. 2.8". LOL! Thanks Jim. OH I almost forgot I was going to say all I can think of when I read "Rotus Blossom" is the Kim Jung Il character from Team America. "OH NO, HANS BRIX!!". He would say "Rotus Brossom"
Edited 1 time(s). Last edit at 11/20/2009 11:46AM by NixVegaGT. |
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