Yeah, I knew that was common in home rebuilds or with used parts, etc. My cousin seemed to think I should wonder about it on the new stuff, but I won't stress over it too much.
Road Race Track/AutoCross 351w
Moderator: Team
Re: Road Race Track/AutoCross 351w
1995 Mustang GT (AutoX/Road Course Car)- Missing an Engine at the Moment...
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.
Re: Road Race Track/AutoCross 351w
If you have the ability to dial in your bearing oil clearances to exactly what you want by mixing half sets why not do it? Nothing back yard or improper about it! We do it often.
Carlquist Competition Engines
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Re: Road Race Track/AutoCross 351w
Most of the time, "garage" builders just won't spend the money for two sets of bearings to only use half of each.
http://www.rmcompetition.com
Specialty engine building at its finest.
Specialty engine building at its finest.
Re: Road Race Track/AutoCross 351w
Interesting! I didn't mean to suggest it wasn't proper or was a bad thing, that was my question to y'all because I wasn't sure, I am just only familiar with home rebuilds where I have seen folks do it. Back in automotive in high school, we rebuilt a 350 Chevy engine doing it that way for one of my teacher's trucks. It wasn't a slap it together deal, everything was mic'd and checked carefully, but it was just a bunch of high school kids that did it in the shop (the teacher got a good deal with all that free labor...he still drives the truck today, so I guess we did alright!).
Just didn't know if it was a normal thing with new parts. I couldn't see any other way to do it better, but thought maybe when they started off with a new crank they eased into the machining on the crank to get it very close or something. I dunno, I just wasn't sure to be honest! Thanks for clearing me up there!
Just didn't know if it was a normal thing with new parts. I couldn't see any other way to do it better, but thought maybe when they started off with a new crank they eased into the machining on the crank to get it very close or something. I dunno, I just wasn't sure to be honest! Thanks for clearing me up there!
1995 Mustang GT (AutoX/Road Course Car)- Missing an Engine at the Moment...
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.
Re: Road Race Track/AutoCross 351w
Getting closer!
You do not have the required permissions to view the files attached to this post.
1995 Mustang GT (AutoX/Road Course Car)- Missing an Engine at the Moment...
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.
Re: Road Race Track/AutoCross 351w
I am BEYOND impressed with this new engine!
I got a call from my engine builder last Monday afternoon. He told me that the engine was pretty much finished. He had a guy whose engine was supposed to be on the dyno ahead of me, but they were still waiting on some parts. Asked me if I wanted to run it this past week. Obviously, yes! But I was supposed to be going to Nebraska for work on Wednesday. I was able to delay my trip by a day and go dyno this bad boy. And it didn't disappoint!
Tuesday night, they put it on the dyno and used their 850 cfm carb to test fire and run it in. Figured if it was gonna window the block, they might as well know that before I took a day off work. After a little tuning and timing changes, it ran out to 645HP on 110 octane race gas.
When I brought the Holley Sniper to them on Wednesday, we installed it, put in some 93 pump gas, and played with the tuning. Peak power at 635HP!
The slight power loss was pretty easy to stomach. Their carb setup was a little leaner at WOT than we tuned the Sniper for, we were running 93 instead of 110, and the Sniper is 800 CFM compared to 850 CFM for their carb.
I got a call from my engine builder last Monday afternoon. He told me that the engine was pretty much finished. He had a guy whose engine was supposed to be on the dyno ahead of me, but they were still waiting on some parts. Asked me if I wanted to run it this past week. Obviously, yes! But I was supposed to be going to Nebraska for work on Wednesday. I was able to delay my trip by a day and go dyno this bad boy. And it didn't disappoint!
Tuesday night, they put it on the dyno and used their 850 cfm carb to test fire and run it in. Figured if it was gonna window the block, they might as well know that before I took a day off work. After a little tuning and timing changes, it ran out to 645HP on 110 octane race gas.
When I brought the Holley Sniper to them on Wednesday, we installed it, put in some 93 pump gas, and played with the tuning. Peak power at 635HP!
The slight power loss was pretty easy to stomach. Their carb setup was a little leaner at WOT than we tuned the Sniper for, we were running 93 instead of 110, and the Sniper is 800 CFM compared to 850 CFM for their carb.
You do not have the required permissions to view the files attached to this post.
1995 Mustang GT (AutoX/Road Course Car)- Missing an Engine at the Moment...
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.
Re: Road Race Track/AutoCross 351w
So with reliability and on track mileage primary goals, that is a starting point 6500 rpm shift point motor?
Re: Road Race Track/AutoCross 351w
Autocrossing tries to emulate a road course in a very scaled down venue. Hence, you shift to your nominal gear before the first timing cone and leave it there for the whole run. At least that's the way I did it for time I autocrossed in my TA with an LT1 and 3.91 and close ratio 4 spd. I think in my 5+ years of parking lot racing, I only saw one car with over 500hp and he only brought it out on bigger courses. Gimpy will have plenty of RPM margin for bigger tracks using his favorite gear. Keeping his 200tw tires planted will be a challenge. Sliding is fun, but it's slower than a non-sliding car.
Re: Road Race Track/AutoCross 351w
I shift to second pretty quick and leave it there on AutoX runs. Typically don't turn more than 6300 at AutoX, at least on the courses we run. The lowest we pulled on the dyno was 3700 RPM, and it had 504 lb/ft of torque, so I don't think it'll have a problem pulling out of the slow elements. The plan is to not turn more than 7000 RPMs, but I think there's plenty of meat there to make it count.
I will definitely need to upgrade to 315s soon, though. The 275s probably won't do the trick.
I will definitely need to upgrade to 315s soon, though. The 275s probably won't do the trick.
1995 Mustang GT (AutoX/Road Course Car)- Missing an Engine at the Moment...
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.
Re: Road Race Track/AutoCross 351w
I guess we see things differently. When OP mentions repeatedly AX & RC events, and then follows with goals of engine reliability and mileage, I disregard the normal AX objectives, as IMO, little carries over between the two.Rick! wrote: ↑Tue May 11, 2021 2:16 pmAutocrossing tries to emulate a road course in a very scaled down venue. Hence, you shift to your nominal gear before the first timing cone and leave it there for the whole run. At least that's the way I did it for time I autocrossed in my TA with an LT1 and 3.91 and close ratio 4 spd. I think in my 5+ years of parking lot racing, I only saw one car with over 500hp and he only brought it out on bigger courses. Gimpy will have plenty of RPM margin for bigger tracks using his favorite gear. Keeping his 200tw tires planted will be a challenge. Sliding is fun, but it's slower than a non-sliding car.
Re: Road Race Track/AutoCross 351w
When I say "reliability", I don't necessarily mean that the engine will last for 10 years, getting run hard most of the time. I fully understand that the engine will probably need some refreshing after 2-3 years. I mainly mean "reliable" in the sense that I'm not sweating bullets while looking at 10 PSI on the oil gauge at every stoplight or worrying that I'm gonna eject a couple rods out the bottom every time I run the RPMs up, or crack a piston, etc. My old engine had 15-20 PSI on the oil gauge when hot, which checks out after seeing the bearings. I think the balance job was pretty bad in that engine, too, it never felt like a finely balanced engine. "Reliability" in the race car sense of the word, where it's strong enough that I can enjoy it and not worry so much that I'm gonna throw a rod.j-c-c wrote: ↑Thu May 13, 2021 11:07 pmI guess we see things differently. When OP mentions repeatedly AX & RC events, and then follows with goals of engine reliability and mileage, I disregard the normal AX objectives, as IMO, little carries over between the two.Rick! wrote: ↑Tue May 11, 2021 2:16 pmAutocrossing tries to emulate a road course in a very scaled down venue. Hence, you shift to your nominal gear before the first timing cone and leave it there for the whole run. At least that's the way I did it for time I autocrossed in my TA with an LT1 and 3.91 and close ratio 4 spd. I think in my 5+ years of parking lot racing, I only saw one car with over 500hp and he only brought it out on bigger courses. Gimpy will have plenty of RPM margin for bigger tracks using his favorite gear. Keeping his 200tw tires planted will be a challenge. Sliding is fun, but it's slower than a non-sliding car.
1995 Mustang GT (AutoX/Road Course Car)- Missing an Engine at the Moment...
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.
Tremec TR-3550 Transmission, 3.73 gears
Maximum Motorsports Coilovers, 400/275 lb/in Springs
MM Torque Arm, Fays2 Watts Link
Way too much else to list...issa money pit.