Slant 6 Turbo 68Dart Project
Serj, the problem I see with that is with Wiseco pistons you need to use either the K1/Molnar rod or a 198 rod may work. And then in the end, you will end up like Bill and have 9:1 compression. Except he can run on race gas and you can't. Pretty much, your only other options are custom pistons. Either through Flatlander or other well known companies. The good news is I hear custom pistons are getting cheaper... Would've been a lot simpler if Wiseco had just made a plain stock replacement forged piston. I guess that'd be too easy :violent1:
Oh, another thing. If you find the OCG Mech cam spec sheet over at .org (it's in the engine FAQs) look at the 1793D cam. I think that is a nice, simple, single pattern grind that has all the characteristics you'd want. Small duration, semi-aggressive lobes, high lift. Just have it ground at a 111-112 duration. Should come on nice and strong right off idle, and I wouldn't be surprised if it kept pulling to 5k.
Specs: [email protected] duration, [email protected], .485 lift with a 1.5 rocker
Bill, A few things:
Pressure gauge in the exhaust. Yup, hands down agree that would be a wonderful thing to have.
Those charts were supposed to be in one of the Hot Rod articles. HR may have removed them or something, I found them elsewhere and figured it was a decent visual aid. However. The turbo one is a little bit misleading. You see, the turbo i/e pressure ratio shown is what I would consider a pretty efficient. It can vary from as good as that, to looking like the supercharged one. With the intake and exhaust pressures switched. :shock: So pretty much, your cam profile could change drastically for each one. That's the problem with these turbo setups, no two are the same. I've yet to see two that were similar enough to be a decent comparison. Therefore, what may work and be good for one may not be the same for the other. You could have small overlap for fear of blowing the charge out the tailpipe, you could run overlap that would compare to RV-mild N/A cams (if the pressure ratios are similar) or you could have super minimal overlap (like, 244* cam on a 115 LSA) to prevent uncontrollable EGR.
Now all motor builds on the other hand... :D but I digress. You all know by now the ins and outs of both. You chose the rocky road, but I still wish you all luck!
And Bill, sorry, but there ain't much I can do with that information. At first I thought it might have been one of their 'Cheetah' series GN upgrade turbos, but the 66mm puts us in the dark there. The best I can assume is it is some form of a T3/T4 hybrid maybe? The stock GN turbo was considered this. Pretty much, there are different frame sizes of turbo compressors and turbines, with the t4 and the t3 being the more popular of them all. The t3 is smaller and the t4 bigger. Simply put, the hybrid combines the small, quick spooling t3 turbine with the large, air moving t4 compressor. Best of both worlds. Anywho, heres a little graphic that may help us out. Wouldn't happen to remember the shape of the flange would you? (I do believe this is metric)
Serj, the problem I see with that is with Wiseco pistons you need to use either the K1/Molnar rod or a 198 rod may work. And then in the end, you will end up like Bill and have 9:1 compression. Except he can run on race gas and you can't. Pretty much, your only other options are custom pistons. Either through Flatlander or other well known companies. The good news is I hear custom pistons are getting cheaper... Would've been a lot simpler if Wiseco had just made a plain stock replacement forged piston. I guess that'd be too easy :violent1:
Oh, another thing. If you find the OCG Mech cam spec sheet over at .org (it's in the engine FAQs) look at the 1793D cam. I think that is a nice, simple, single pattern grind that has all the characteristics you'd want. Small duration, semi-aggressive lobes, high lift. Just have it ground at a 111-112 duration. Should come on nice and strong right off idle, and I wouldn't be surprised if it kept pulling to 5k.
Specs: [email protected] duration, [email protected], .485 lift with a 1.5 rocker
Bill, A few things:
Pressure gauge in the exhaust. Yup, hands down agree that would be a wonderful thing to have.
Those charts were supposed to be in one of the Hot Rod articles. HR may have removed them or something, I found them elsewhere and figured it was a decent visual aid. However. The turbo one is a little bit misleading. You see, the turbo i/e pressure ratio shown is what I would consider a pretty efficient. It can vary from as good as that, to looking like the supercharged one. With the intake and exhaust pressures switched. :shock: So pretty much, your cam profile could change drastically for each one. That's the problem with these turbo setups, no two are the same. I've yet to see two that were similar enough to be a decent comparison. Therefore, what may work and be good for one may not be the same for the other. You could have small overlap for fear of blowing the charge out the tailpipe, you could run overlap that would compare to RV-mild N/A cams (if the pressure ratios are similar) or you could have super minimal overlap (like, 244* cam on a 115 LSA) to prevent uncontrollable EGR.
Now all motor builds on the other hand... :D but I digress. You all know by now the ins and outs of both. You chose the rocky road, but I still wish you all luck!
And Bill, sorry, but there ain't much I can do with that information. At first I thought it might have been one of their 'Cheetah' series GN upgrade turbos, but the 66mm puts us in the dark there. The best I can assume is it is some form of a T3/T4 hybrid maybe? The stock GN turbo was considered this. Pretty much, there are different frame sizes of turbo compressors and turbines, with the t4 and the t3 being the more popular of them all. The t3 is smaller and the t4 bigger. Simply put, the hybrid combines the small, quick spooling t3 turbine with the large, air moving t4 compressor. Best of both worlds. Anywho, heres a little graphic that may help us out. Wouldn't happen to remember the shape of the flange would you? (I do believe this is metric)