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Post by Admin on May 18, 2017 11:31:20 GMT -6
Forgot, piston pin will be small Nascar size of, .787x.200x2.5 chrome moly. Also to not all Nascar top teams run the smaller crank pin size as well.
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Post by Admin on May 23, 2017 15:39:15 GMT -6
Does anyone know where I could get a set of heads? Hmmmm found these. 3 sets of 1600, 1 set of 1500, lol.
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Post by Admin on May 23, 2017 15:40:04 GMT -6
Carb and intake I will be using
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Post by Lagger on May 23, 2017 15:41:15 GMT -6
Mikuni slide valve?
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Post by Admin on May 23, 2017 15:44:18 GMT -6
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Post by Lagger on May 23, 2017 15:45:19 GMT -6
Nice, but I'm curious, why abandon FI?
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Post by Admin on May 23, 2017 15:55:38 GMT -6
Nice, but I'm curious, why abandon FI? Power, plain and simple lol. Also getting away from the ecu opens up the major bottle neck with these. With the big intake and big Carb, it will breath much better, I will be able to adjust timing and Rev limiter with the aftermarket ignition as well.
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Post by Kahn on May 23, 2017 20:11:26 GMT -6
Nice, but I'm curious, why abandon FI? Power, plain and simple lol. Also getting away from the ecu opens up the major bottle neck with these. With the big intake and big Carb, it will breath much better, I will be able to adjust timing and Rev limiter with the aftermarket ignition as well. In what is clearly a brave new world for these Vulcan engines, what would you expect a practical redline to be pegged at?
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Post by Admin on May 23, 2017 20:15:29 GMT -6
Power, plain and simple lol. Also getting away from the ecu opens up the major bottle neck with these. With the big intake and big Carb, it will breath much better, I will be able to adjust timing and Rev limiter with the aftermarket ignition as well. In what is clearly a brave new world for these Vulcan engines, what would you expect a practical redline to be pegged at? On this one, not sure but if valve springs can take it, 7400-7600
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Post by Lagger on May 23, 2017 23:18:04 GMT -6
Nice, but I'm curious, why abandon FI? Power, plain and simple lol. Also getting away from the ecu opens up the major bottle neck with these. With the big intake and big Carb, it will breath much better, I will be able to adjust timing and Rev limiter with the aftermarket ignition as well. Ah ha, I missed the bit about aftermarket ignition - presumably using crank position sensors etc. very interesting. I built a car engine for more power but went the opposite way - swapped from twin Weber 40DCOE twin choke carburettors to Jenvey throttle bodies and an after market ignition system for the same reason. Just out of interest, could you not have gone for single choke inlets for each cylinder together with larger throttle bodies and bigger injectors?
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Post by Kahn on May 23, 2017 23:35:57 GMT -6
Power, plain and simple lol. Also getting away from the ecu opens up the major bottle neck with these. With the big intake and big Carb, it will breath much better, I will be able to adjust timing and Rev limiter with the aftermarket ignition as well. Ah ha, I missed the bit about aftermarket ignition - presumably using crank position sensors etc. very interesting. I built a car engine for more power but went the opposite way - swapped from twin Weber 40DCOE twin choke carburettors to Jenvey throttle bodies and an after market ignition system for the same reason. Just out of interest, could you not have gone for single choke inlets for each cylinder together with larger throttle bodies and bigger injectors? Lagger, I had a 1975 Twin Cam Cosworth Vega. Yes, the little Vega that *could* Had a corvette tranny and axle from the factory. It also had GM WORST implementation of FI ever. After getting stranded by the FI numerous times, we ripped out all the FI black boxes and electronics and installed twin Webers with a custom manifold. The power increased enormously and had I not managed to get the car to do 3 end over ends onto somebody's lawn in Manchester, NH many moons ago, I'd likely still have that little screamer. What a blast of a small car that was!
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Post by Admin on May 24, 2017 1:08:16 GMT -6
Power, plain and simple lol. Also getting away from the ecu opens up the major bottle neck with these. With the big intake and big Carb, it will breath much better, I will be able to adjust timing and Rev limiter with the aftermarket ignition as well. Ah ha, I missed the bit about aftermarket ignition - presumably using crank position sensors etc. very interesting. I built a car engine for more power but went the opposite way - swapped from twin Weber 40DCOE twin choke carburettors to Jenvey throttle bodies and an after market ignition system for the same reason. Just out of interest, could you not have gone for single choke inlets for each cylinder together with larger throttle bodies and bigger injectors? The stock manifold and throttle body is independent 40mm to each cylinder. The tb it's self isn't too bad but the intake is, IMO shit. I have in my head toyed with a single 50mm throttle body along with custom intake. This would be bad ass and I would use a microsqirt stand alone ecu. These are bad ass units but you have to set every parameter imaginable and I just did not have the knowledge or time but I will at some point. I had ran big injectors with stock tb, worked perfectly but took a lot of tuning. Stock injectors are 289cc, I ran 450cc 5-0 brand. I also had converted over to 100% e85, that worked incredible but it takes do much of it and range per tank was shit. Last build took 28% more fuel than you would ever put to a big three Modded meanie. E85 I was +30% over that, but it ran well. Even though with + 28% I get 45mpg easy and on highway close to 50. Let's see what I get with this one!
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Post by Lagger on May 24, 2017 2:48:12 GMT -6
Ah ha, I missed the bit about aftermarket ignition - presumably using crank position sensors etc. very interesting. I built a car engine for more power but went the opposite way - swapped from twin Weber 40DCOE twin choke carburettors to Jenvey throttle bodies and an after market ignition system for the same reason. Just out of interest, could you not have gone for single choke inlets for each cylinder together with larger throttle bodies and bigger injectors? The stock manifold and throttle body is independent 40mm to each cylinder. The tb it's self isn't too bad but the intake is, IMO shit. I have in my head toyed with a single 50mm throttle body along with custom intake. This would be bad ass and I would use a microsqirt stand alone ecu. These are bad ass units but you have to set every parameter imaginable and I just did not have the knowledge or time but I will at some point. I had ran big injectors with stock tb, worked perfectly but took a lot of tuning. Stock injectors are 289cc, I ran 450cc 5-0 brand. I also had converted over to 100% e85, that worked incredible but it takes do much of it and range per tank was shit. Last build took 28% more fuel than you would ever put to a big three Modded meanie. E85 I was +30% over that, but it ran well. Even though with + 28% I get 45mpg easy and on highway close to 50. Let's see what I get with this one! Thanks - I mixed up my terminology - by choke I actually meant inlet. I agree with you that the manifold isn't the world's best, even opened out a bit it's not great, personally I dislike siamesed porting in any form. I liked your idea of using two rear cylinders but then this creates a problem with trying to create equal length inlet tracts, especially with the pretty limited space we have to play within between the jugs.
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Post by Admin on May 24, 2017 2:55:56 GMT -6
The stock manifold and throttle body is independent 40mm to each cylinder. The tb it's self isn't too bad but the intake is, IMO shit. I have in my head toyed with a single 50mm throttle body along with custom intake. This would be bad ass and I would use a microsqirt stand alone ecu. These are bad ass units but you have to set every parameter imaginable and I just did not have the knowledge or time but I will at some point. I had ran big injectors with stock tb, worked perfectly but took a lot of tuning. Stock injectors are 289cc, I ran 450cc 5-0 brand. I also had converted over to 100% e85, that worked incredible but it takes do much of it and range per tank was shit. Last build took 28% more fuel than you would ever put to a big three Modded meanie. E85 I was +30% over that, but it ran well. Even though with + 28% I get 45mpg easy and on highway close to 50. Let's see what I get with this one! Thanks - I mixed up my terminology - by choke I actually meant inlet. I agree with you that the manifold isn't the world's best, even opened out a bit it's not great, personally I dislike siamesed porting in any form. I liked your idea of using two rear cylinders but then this creates a problem with trying to create equal length inlet tracts, especially with the pretty limited space we have to play within between the jugs. Yea backed off the two rear head, no time to fab intake or exhaust
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Post by Lagger on May 24, 2017 3:04:55 GMT -6
Thanks - I mixed up my terminology - by choke I actually meant inlet. I agree with you that the manifold isn't the world's best, even opened out a bit it's not great, personally I dislike siamesed porting in any form. I liked your idea of using two rear cylinders but then this creates a problem with trying to create equal length inlet tracts, especially with the pretty limited space we have to play within between the jugs. Yea backed off the two rear head, no time to fab intake or exhaust I think it's a good idea but it's certainly not a 5 minute job - especially for me as my fabrication skills are terrible!
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Post by Lagger on Jun 28, 2017 9:33:10 GMT -6
Admin - a quick question regarding your high compression builds - do you still keep the KACR or dump it? When I rebuilt my BUBF I dumped it since I didn't want to risk it breaking and dropping bits into the engine, the only downside I noted was it was sometimes a bit of bitch to hot start. This is a question on my horizon since I am getting closer to starting on my engine rebuild (it'll be in standard trim to begin with, an HC version will be my winter project).
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Post by Admin on Jun 28, 2017 9:35:17 GMT -6
Trash the kacr. No issues here. Starts just fine.
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Post by Lagger on Jun 28, 2017 9:42:40 GMT -6
Trash the kacr. No issues here. Starts just fine. Great stuff, good to know. I'll trash them, I'm not a huge fan of the design of that thing, bob weights and a flimsy spring just waiting to let go and drop something down into the valves to wreck the engine. Thanks for the help :-)
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