LS6 conversion to 90 MM
LS6 conversion to 90 MM I have looked around and read quite a lot. I am going to give this one a shot to see what kind of gains i can get on my Cammed 346. anyway my questions are.
Does anyone have epoxy suggestions?
also, does it have to be the snout off of an LS2 manifold or will the 90mm truck intakes work also.
open to all suggestions on this project. I just don't feel like paying $350 for someone else to do something that I can do.
Does anyone have epoxy suggestions?
also, does it have to be the snout off of an LS2 manifold or will the 90mm truck intakes work also.
open to all suggestions on this project. I just don't feel like paying $350 for someone else to do something that I can do.
that is very true....... the opening on an ls6 intake is made for a 78mm.....but a lot of people run the bbk 80mm with an adapter ring...and people are still buying it soo it must have some benefit.....as long at the motor is craving more air then the throttle body along with a bigger intake plenum is the key to giving the motor what it wants...but keep in mind that an ls6 intake flows better than the ls2...and the ls6 is giving up throttle body size
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Here is the link for the company who makes the LS6 intake with a 90mm mouth
http://www.tpis.com/parts/view/39
http://www.tpis.com/parts/view/39
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From: Turnin' Wrenches Infractions: 005
Nope, doesn't work that way. People buy Snuggies (backwards robes) so your argument is null and void. You cannot trust people buying something as a valid reason to trust the product.
After taking some measurments and thinking, Yes the LS6 intake has a 78 (ish) mm opening. and i have about a 75 mm throttle body.
but in the middle of that there is a blade, and shaft ( that shaft is 10MM in diameter) so my throttle body has an "actual" size of 65 mm so a larger (bbk ) throttle body means it COULD flow that much air.... Still looking for a solution that doesn't cost insane amounts of money $350 for someone to do an ugly glue job + 200 minimum fora throttle body.
but in the middle of that there is a blade, and shaft ( that shaft is 10MM in diameter) so my throttle body has an "actual" size of 65 mm so a larger (bbk ) throttle body means it COULD flow that much air.... Still looking for a solution that doesn't cost insane amounts of money $350 for someone to do an ugly glue job + 200 minimum fora throttle body.
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After taking some measurments and thinking, Yes the LS6 intake has a 78 (ish) mm opening. and i have about a 75 mm throttle body.
but in the middle of that there is a blade, and shaft ( that shaft is 10MM in diameter) so my throttle body has an "actual" size of 65 mm so a larger (bbk ) throttle body means it COULD flow that much air.... Still looking for a solution that doesn't cost insane amounts of money $350 for someone to do an ugly glue job + 200 minimum fora throttle body.
but in the middle of that there is a blade, and shaft ( that shaft is 10MM in diameter) so my throttle body has an "actual" size of 65 mm so a larger (bbk ) throttle body means it COULD flow that much air.... Still looking for a solution that doesn't cost insane amounts of money $350 for someone to do an ugly glue job + 200 minimum fora throttle body.
I don't recall the period, but, think I remember posting how to get the LS6 to 85mm or a little more without the need for cutting off the inlet & then installing the LS2 inlet. It was maybe 1.5-2yrs ago. A search will probably locate it if you're interested in a compromise without the extra hassle.
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I don't recall the period, but, think I remember posting how to get the LS6 to 85mm or a little more without the need for cutting off the inlet & then installing the LS2 inlet. It was maybe 1.5-2yrs ago. A search will probably locate it if you're interested in a compromise without the extra hassle.
Maybe this?
https://ls1tech.com/forums/generatio...s6-intake.html
Yah, that's it. 1999BlueTA has a link to it in the first post. Thanks
SWEET link .. and very nice job LS1-450 what throttle body did you use. I'm thinking maybe possibly a TBSS throttle body will work with an adapter/spacer on it? i am drive by wire
what precautions did you use to make sure you didn't go through the thinwall on the neck of the intake manifold.
I'd love to hear more about how you ported the runners.
I have an LS1 with 241 Katech ( no flow numbers) ported heads with sodium filled LS6 valves. a 239/247 .623/.623 114 LSA cam shaft. I am running .040 thick head gaskets.
I really wanted over 425 RWHP on the dyno and had hopes of 385-90 ft lbs of torque. I'm currently spinning to 6800 RPM it flat-lined from about 6500 on up. hit 417 HP and 378 ft lbs of torque. after measuring my previous cold air intake i tossed it (83mm) put a bigger cone, and deleted the maf in favor of an SD tune.
I do plan to supercharge the car at some point I know the better flow i have now the better it will be then too. and have had fantasies of adding a 100 shot until i can fully afford the blower.
what precautions did you use to make sure you didn't go through the thinwall on the neck of the intake manifold.
I'd love to hear more about how you ported the runners.
I have an LS1 with 241 Katech ( no flow numbers) ported heads with sodium filled LS6 valves. a 239/247 .623/.623 114 LSA cam shaft. I am running .040 thick head gaskets.
I really wanted over 425 RWHP on the dyno and had hopes of 385-90 ft lbs of torque. I'm currently spinning to 6800 RPM it flat-lined from about 6500 on up. hit 417 HP and 378 ft lbs of torque. after measuring my previous cold air intake i tossed it (83mm) put a bigger cone, and deleted the maf in favor of an SD tune.
I do plan to supercharge the car at some point I know the better flow i have now the better it will be then too. and have had fantasies of adding a 100 shot until i can fully afford the blower.
SWEET link .. and very nice job LS1-450 what throttle body did you use. I'm thinking maybe possibly a TBSS throttle body will work with an adapter/spacer on it? i am drive by wire
what precautions did you use to make sure you didn't go through the thinwall on the neck of the intake manifold.
I'd love to hear more about how you ported the runners.
I have an LS1 with 241 Katech ( no flow numbers) ported heads with sodium filled LS6 valves. a 239/247 .623/.623 114 LSA cam shaft. I am running .040 thick head gaskets.
I really wanted over 425 RWHP on the dyno and had hopes of 385-90 ft lbs of torque. I'm currently spinning to 6800 RPM it flat-lined from about 6500 on up. hit 417 HP and 378 ft lbs of torque. after measuring my previous cold air intake i tossed it (83mm) put a bigger cone, and deleted the maf in favor of an SD tune.
I do plan to supercharge the car at some point I know the better flow i have now the better it will be then too. and have had fantasies of adding a 100 shot until i can fully afford the blower.
what precautions did you use to make sure you didn't go through the thinwall on the neck of the intake manifold.
I'd love to hear more about how you ported the runners.
I have an LS1 with 241 Katech ( no flow numbers) ported heads with sodium filled LS6 valves. a 239/247 .623/.623 114 LSA cam shaft. I am running .040 thick head gaskets.
I really wanted over 425 RWHP on the dyno and had hopes of 385-90 ft lbs of torque. I'm currently spinning to 6800 RPM it flat-lined from about 6500 on up. hit 417 HP and 378 ft lbs of torque. after measuring my previous cold air intake i tossed it (83mm) put a bigger cone, and deleted the maf in favor of an SD tune.
I do plan to supercharge the car at some point I know the better flow i have now the better it will be then too. and have had fantasies of adding a 100 shot until i can fully afford the blower.
Thanks,
-Used a Summit 85mm. Should mention that it was bought before Summit decided to way over price them. When purchased, it was in the $75 range.
-No precautions made; was just careful to watch & feel w/ hand how much material remained.
-As to "how were the runners ported"; don't. Just port match to the heads. Made this comment in the write up. Porting the runners will only slow the airspeed which will result in less air fed to the combustion chamber. From what I've measured, the only time to port runners is on engines w/ larger than stock 346 cu. displacement. Stock displacement just doesn't move a high enough volume of air to benefit from it. GM did a friggin' great job w/ LS6 runner design. This is also evident by the Holley "Street Warrior" fiasco that never happened because they could not improve on it.
-I don't rely on dyno's to accurately measure results from air movement mod's.. There are too many other variables that can effect the numbers. Look @ ambient air conditions against air speed (MAF) & air pressure (MAP). This will more accurately tell you how modifications have effected air flow. Of course, with an SD tune, only MAP is available for air measurement.
Y2K WS6,
Sorry, I try not to double post, but, thought more about your set up. So...
If your LS6 intake opening is stock, it is definitely holding back airflow. Would a$$ume that a cam w/ that much duration & then lift would build power up through 7K. The air restriction is also limiting the advantage of using sodium filled valves. Those valve are expensive & you aught to be getting your moneys' worth.
First, open up intake mouth either w/ 90mm TPS mod or to 85+mm @ home. Then, upgrade to a thicker walled pushrod like a Comp .105" wall 5/16". These two changes should get you all of the air available up through 7K on stock cubes.
Sorry, I try not to double post, but, thought more about your set up. So...
If your LS6 intake opening is stock, it is definitely holding back airflow. Would a$$ume that a cam w/ that much duration & then lift would build power up through 7K. The air restriction is also limiting the advantage of using sodium filled valves. Those valve are expensive & you aught to be getting your moneys' worth.
First, open up intake mouth either w/ 90mm TPS mod or to 85+mm @ home. Then, upgrade to a thicker walled pushrod like a Comp .105" wall 5/16". These two changes should get you all of the air available up through 7K on stock cubes.
I made a thread about this very thing and I got completely **** on.... Well, at least Tony posted in my thread. That was kinda cool.
https://ls1tech.com/forums/generatio...-manifold.html
https://ls1tech.com/forums/generatio...-manifold.html
I made a thread about this very thing and I got completely **** on.... Well, at least Tony posted in my thread. That was kinda cool.
https://ls1tech.com/forums/generatio...-manifold.html
https://ls1tech.com/forums/generatio...-manifold.html
Never did get a chance. I dropped the coin on a P&P Epoxied TB & Chrs1313 Non-AC Ram Air instead. In the future I thought about a FAST 78 with a Shaner S3, or even a TPIS LS6 (already have LS6) and a 90 or 92mm TB.
I still think it's a good idea, and like someone else said, yeah, we have a 75-78mm TB, but you have to account for the blade and shaft. I think stepping to a 90 or 92 with a funnel would be an improvement.
The funnel is the key for velocity though.
I still think it's a good idea, and like someone else said, yeah, we have a 75-78mm TB, but you have to account for the blade and shaft. I think stepping to a 90 or 92 with a funnel would be an improvement.
The funnel is the key for velocity though.
My biggest gripe is that every thing i have found any where, throttle body prices are insane for ANY 90 mm throttle body even the stock GM ones. ... Looking into $$ per HP. this will be 500 for 10 HP or so. kind of annoying. really.
I would be doing all porting and polishing myself. so.that wouldn't be as much of an issue in the cost. just even the bare parts to start with are a lot of $$
I would be doing all porting and polishing myself. so.that wouldn't be as much of an issue in the cost. just even the bare parts to start with are a lot of $$