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With a 3.860 throw, using a 6.2+" rod, you can maintain a 1.6+ rod ratio... some people say it doesn't matter, but I always consider a rod ration above 1.6 a good thing. You can even use Gen IV 4.8 (6.275") rods and ~1.025" CH pistons...
A simple 231/239 118+4, or thereabouts, cam will be a towing monster, even with a conservative 9.5-75:1 static compression ratio.
What kind of lift we looking at 600 ish? This is some great information thanks!
Keep the static compression up. No reason to go lower than 10.5 unless you're running on reg unleaded. If you have 93 octane available, the cam I mentioned won't leave much on the table, will have excellent manners, and will get decent MPG. It will also tear the hitch off of anything you tie on to. 10.5 static with a DCR around 8 to one will exceed your expectations. Much under 220 on the intake on a 6.2L isn't worth the time and money to do a cam swap. Been there, done that.
9.5 static is a lot for that cam and engine on 8lbs. You would have to run race gas for sure or you will be pulling a ton of timing. Your effective compression is like 10.7 at 1500ft altitude. With the 6.2.
I'd knock compression down to 8:1 and have BTR or whoever's build a cam similar to what you got but more lift. No reason to not make 600-650 crank on pump gas and tons of torque.
This is an interesting conundrum. First, we think the move to 9.5-10:1 is a good idea. LSA pistons are used in marine applications similar to towing and do a pretty good job at holding the power, yet quiet etc. We plugged some events into our calculator to set the behaviors. We went -5 (ATDC) intake opening for some civility but still have some character. We closed the intake at 43 abdc which is later than LS1 or LQ9 for instance to move the power band up and bleed a bit of cylinder pressure. We opened the exhaust at 53 bbdc which is a good average all around-er for mileage and power then we closed the exhaust at -4 (BTDC) to limit overlap to -9. The resulting cam is a 218/229 116 + 2. We've looked through the offerings of all of our vendors and don't see anything quite right. We could do a custom with you through Cam Motion or the cam company of your choice and set the lift for .600 to work with a TFS-16918 beehive spring for instance.
I have hundreds of thousands of miles on two TVS blown trucks with CR over 10:1. Never had a failure I attributed to detonation. No, I wouldn't build an engine that way if it was towing heavy loads full time. For a mostly street, occasional tow, I'd keep the compression up. You'll get better mileage and it will perform better out of boost. You'll also need less boost to make the power. Less boost leads to less intake air heat. Intake air temp is a big limiting factor with these top mount blowers.
My last TVS2300 blower finally **** the bed after over 250K miles. The engine under that blower was an 5.3L L33 with ported and slightly milled heads. Over 10:1 CR for sure. The engine is still going strong N/A currently. Just didn't want to spend $2.5K rebuilding the TVS. I mostly ran it at 9psi, but did pulley down to a 3.1 inch blower pulley just to see what it would do. At the higher boost level, I ran low temp ww fluid (I believe it was about half meth). At 9psi, I just used regular ww fluid. It was tuned without either.
Uh, no. We genuinely like helping people out. If we were just trying to make a sale, we'd send people out the door with someone's ill-fitting shelf grind..
Summitracing just trying to make a sale for Cam Motion? Lol. I just think it's cool they actually respond, took the time to spec a cam, and were honest they didn't make the cam needed...
Summitracing just trying to make a sale for Cam Motion?
Absolutely! We sell Comp, BTR, Cam Motion and most of the others as well. If there is a good cam solution in a stocking grind that performs well and saves folks money, we recommend it - but this one was not one of those cases. Steve pops on here quite often and we do customs with them when the need arises. We and Cam Motion often prescribe nearly the same valve events for given combination.
Summit has always been helpful to me when I call them. Unfortunate that the hold times are so long due to the plandemic.
Yes, that's part of the reason we're on here. We try to give you guys a little more LS dedicated guidance than otherwise. We go home at the end of the day like anybody, but we try to be prompt.
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