Spayed Main Caps
10-29-2016, 03:11 PM
#1
Spayed Main Caps I did a little looking around for info about this, but most of what I found is more drag oriented. At what point do yall consider splayed mains a necessity? Buddy of mine had it done to his car, 400rwhp. My motor is going to be making almost dead on that power level, due to us having the same class rules.
The difference between these cars and drag cars is that we are doing wheel to wheel road racing, normal hour and a half races, with us prepping to compete in a 13 hour endurance race. This motor I am building is going to live it's entire life at 4000-7500 RPMs. Splayed mains worth it? Or just stud the 2 bolts?
The difference between these cars and drag cars is that we are doing wheel to wheel road racing, normal hour and a half races, with us prepping to compete in a 13 hour endurance race. This motor I am building is going to live it's entire life at 4000-7500 RPMs. Splayed mains worth it? Or just stud the 2 bolts?
10-29-2016, 06:53 PM
#2
While studded 2bolts will be fine at that power level, going to 4bolt mains is not that expensive and is usually done "just because" since you're in there already. That way if you do upgrade in the future like 99% of people do, you wont have to go back and tackle the same upgrade again.
Straight 4bolt is an option as well, since the main caps should be a bit cheaper and on an LT1 I have even heard it may be just as strong as splayed on our blocks due to the amount of material around the main cap bolts in an LT1 block(no source for this, just old heresay). Keep in mind though that once you go straight 4-bolts, its a lot of work to go splayed and you usually just need to get a new 2bolt block to start with. That's why most just go splayed off the bat.
Again though, if you are sure that you only want 400hp since you will be class limited and endurance racing, then I would just go to studded 2bolt and save the cash.
Straight 4bolt is an option as well, since the main caps should be a bit cheaper and on an LT1 I have even heard it may be just as strong as splayed on our blocks due to the amount of material around the main cap bolts in an LT1 block(no source for this, just old heresay). Keep in mind though that once you go straight 4-bolts, its a lot of work to go splayed and you usually just need to get a new 2bolt block to start with. That's why most just go splayed off the bat.
Again though, if you are sure that you only want 400hp since you will be class limited and endurance racing, then I would just go to studded 2bolt and save the cash.
10-31-2016, 04:12 PM
#5
I'm planning on building a 383 for 500 horse, I'm interested in seeing what my machinist would charge to do spayed 4 bolt mains. Another option I have yet to research but you might want to look into is a 2 bolt girdle. I can't seem to find much about them on these motors, but that's what a friend of mine did on his Olds 403 build and he's probably pushing upwards of 400 horse.
11-01-2016, 04:43 AM
#6
I'm going to talk to my machinist when I get home and see what he thinks. If he says stud it and go, I'll probably do that. On the other hand, I feel like trying to save 500 bucks on a 20,000 build is kinda stupid. I guess I'm trying to find that line between necessary and overkill/wasted money.
