supercharged L-88
Anyone know of any l-88 that was supercharged?
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Neither the Compression Ratio or the Camshaft would work very well with a Supercharger. By the time You change everything to work with the Supercharger You don't have a L-88 anymore.
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The 12 to 1 compression of the L-88 ain't gonna work with a blower. The lumpy L-88 cam isn't right for a blower either. Lower the compression to around 8 to one and put in a cam that doesn't bleed off a lot of the boost and an L-88 would be more suitable to have a blower put on it.
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No0bs :rolleyes:
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I agree. Most engine builders I've talked to said that if you bolted a blower on an L-88, bring a box to pick up the pieces of your engine after the first pass. I've spoken to Mr. Langdon who agreed as well,although he did know of some blown L-88's used in marine racing applications.My question is, if in 1968, you needed your Corvette to produce a great deal more horsepower than a stock L-88, how would you do it?
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Originally Posted by c14
(Post 1599282926)
I agree. Most engine builders I've talked to said that if you bolted a blower on an L-88, bring a box to pick up the pieces of your engine after the first pass. I've spoken to Mr. Langdon who agreed as well,although he did know of some blown L-88's used in marine racing applications.My question is, if in 1968, you needed your Corvette to produce a great deal more horsepower than a stock L-88, how would you do it?
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^^^^They could make plenty of power then even with ltd choices compared to today.
Joe Sherman was going 9s in early 1970s? with an NA 350. Were spoiled today..nothing like a roots blower to give some attitude, with a BB the power is nuts. Drove a buddys tubbed 70 nova with a mild 454 6-71 it was pretty difficult to control when it broke loose....thats just lightly rolling into the throttle too. |
So.... To build this blown L-88 we would start with the 4 bolt L-88 block,crank and rods,drop the compression (different pistons ?) and change out the stock cam. Would you happen to know the specs of a cam that would work with a blower? In 68, the aluminum heads are closed chamber. Would the supercharger work with the closed chamber heads or would it be necessary to modify the chambers and ports? If modification was necessary,would you happen to know what the mods would be? Could the factory L-88 intake be used? Since the stock intake plenum lacks a divider,would this effect the charge distribution to the cylinders? Would the blown engine be able to use the 4150 holley that came stock? Would the carb also need to be modified? Would anyone know on what side of the block the blower would have been located? Now, the main question, how much horsepower would this motor have been able to make and at what rpm? Finally, if the blower was removed and the modified carb replaced with a stock 4150, do you think this low compression,de-camed L-88 would be a more streetable car than a stock L-88?
Thanks again |
Originally Posted by c14
(Post 1599286857)
So.... To build this blown L-88 we would start with the 4 bolt L-88 block,crank and rods,drop the compression (different pistons ?) and change out the stock cam. Would you happen to know the specs of a cam that would work with a blower? In 68, the aluminum heads are closed chamber. Would the supercharger work with the closed chamber heads or would it be necessary to modify the chambers and ports? If modification was necessary,would you happen to know what the mods would be? Could the factory L-88 intake be used? Since the stock intake plenum lacks a divider,would this effect the charge distribution to the cylinders? Would the blown engine be able to use the 4150 holley that came stock? Would the carb also need to be modified? Would anyone know on what side of the block the blower would have been located? Now, the main question, how much horsepower would this motor have been able to make and at what rpm? Finally, if the blower was removed and the modified carb replaced with a stock 4150, do you think this low compression,de-camed L-88 would be a more streetable car than a stock L-88?
Thanks again |
If you were going to "Do It Right" about the only thing you would use from an L-88 motor would be the block and maybe the crank.
Throw everything else away and replace with components made for a supercharged motor. Could you put an 871 on an L88? Sure, if you only wanted to look cool and idle around town. Good luck finding fuel and as stated earlier, keep a basket in the passenger seat to pick up all the parts if you ever get into the throttle. |
Wrong engine to use in a supercharged application on so many levels.
Next question! Adam |
Three posts since 2009, very active member. I think Paxton was making superchargers back then (just being nice to the bot) so you could use the L88 intake and carb if you knew what you were doing (no internet for DYI'ers)
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First, I apologize for confusing a roots type blower with a centrifugal supercharger. I am fairly certain that the supercharger used was a Paxton and it was attached to the left front of the block. I agree with you and the others that have posted that an L-88 is not a good match to a supercharger. and yet it was done.The possible reason it was done could help explain why it was attempted in the first place. First, about the heads, all L-88 engines until mid production 1969 had closed chamber heads. The chambers on the 68 L-88 I'm asking about have been modified. Also ,there are two sets of numbers visible on the head by the chambers. I think the first set may relate to chamber volume. The other set of numbers may have to do with flow, but I'm not sure. The reason I asked about the head mods was I wondered if back in 1968 if that was standard procedure to build a blown big block.Although it's possible a different intake was fitted, I think the original intake was used as it is also modified (port matched) The carb was specially built by Holley for the engine. The carb is gone so I don't know if Holley modified the original carb or supplied a different carb. As you mentioned two carbs might work better but I think only one was used. I asked about streetability because when the car was acquired by the second owner ,after he replaced the modified carb with an original one and changed the rear ratio (4:88 to 4:11} the car became very driveable (blower was already gone). He also told me how he had the chance to drive a Nickey camaro with a factory L-88 and how different that engine felt compared to his. I asked about the cam because I don't know if the blower cam was removed along with the blower or if it is still in place.Finally, I haven't posted about this before because supercharging an L-88 just didn't make sense.
Thanks again for all the replies Your information is most appreciated |
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