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#11
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I think you are going to find you are too low on compression. The std merc/gm long blocks are 8.75 to 1 with a DOMED piston and 118 cc chambers. An option might be to find some heads with smaller chambers. Lower compression in n/a engines really hurts performance. If you go with what you have, that cam is plenty big.
#14
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You mentioned 509cid.
Are these the pistons ?
#257984
cid 509
Bore 4.500
Stroke 4.000
Rod 6.135
Deck Height 9.780
Compression Height 1.645
110cc 9.5
118cc 9.0
124cc 8.6
Dome Volume -3.0cc
Grams 690
http://www.jepistons.com/Catalogs/Au.../flat_top.aspx
Are these the pistons ?
#257984
cid 509
Bore 4.500
Stroke 4.000
Rod 6.135
Deck Height 9.780
Compression Height 1.645
110cc 9.5
118cc 9.0
124cc 8.6
Dome Volume -3.0cc
Grams 690
http://www.jepistons.com/Catalogs/Au.../flat_top.aspx
#15
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with that piston&114 cc chamber you are slightly over 9 to 1 and with your existing cam i would expect 500 hp.i 100% agree that you should call bob m before proceding with this build.i have been selecting camshafts for my engine building needs for years but since i started working with bob i realize that i will make more power with his knoledge behind me.bob is a great guy and very easy to talk to.
#16
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Join Date: Mar 2014
Location: Weatherford TX
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Thats them
You mentioned 509cid.
Are these the pistons ?
#257984
cid 509
Bore 4.500
Stroke 4.000
Rod 6.135
Deck Height 9.780
Compression Height 1.645
110cc 9.5
118cc 9.0
124cc 8.6
Dome Volume -3.0cc
Grams 690
http://www.jepistons.com/Catalogs/Au.../flat_top.aspx
Are these the pistons ?
#257984
cid 509
Bore 4.500
Stroke 4.000
Rod 6.135
Deck Height 9.780
Compression Height 1.645
110cc 9.5
118cc 9.0
124cc 8.6
Dome Volume -3.0cc
Grams 690
http://www.jepistons.com/Catalogs/Au.../flat_top.aspx
#17
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Location: Weatherford TX
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My build sheet says 116 cc chambers so still at least 9.0/1 .I did send Bob an email to get his opinion
with that piston&114 cc chamber you are slightly over 9 to 1 and with your existing cam i would expect 500 hp.i 100% agree that you should call bob m before proceding with this build.i have been selecting camshafts for my engine building needs for years but since i started working with bob i realize that i will make more power with his knoledge behind me.bob is a great guy and very easy to talk to.
#18
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With that small of a motor I would want a 112 lsa but as stated b4 you just can't beat a custom billet cam and distributor from Bob for $350. There is a big shot out there with a carb shop that builds overpriced carbs with bad fuel curves and has magical cam grinds that are ground when the stars are perfectly aligned. He charges $500 for his cams that can be bought from Erson with the identical specs for $250. Bobs cams might not be ground when the stars are in perfect alignment but you would think they were after you drop the motor in the boat and take it for a sea trial...
#20
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Location: Between A Womans Leggs in IL
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BTW call bob,,his knowledge will smoke your mind,,
Last edited by FIXX; 09-23-2014 at 11:50 PM.