Tell ya what. Degree that cam then retard it 4* and get back to me. As said, lets get back to subject on hand or start another thread.
Well when you said "Comp 240 hyd.", that's what I expected the cam to be. I still call "B.S." on your low 12s claim. The '69 Boss 302 ran a mid 14, and was far more powerful than the motor you described.
I'm also a firm believer in the bigger carb is better theory based on my own experience (306 with 810 dp back in 1990 ran 12.0 in my maverick) and that of some of my friends that ran similar small cube large carb combos. And I emphasize that last word "combo" because that's the key. However in the case of the car you're building for your son with 411 gears, WTF? Why are you looking for more power? I would never build a car like that for my kid as his / her first car because I love my kids and I wouldn't want them to have that much power with so little experience driving.
Give it a break. The 69 Boss ran 14.40s....yes .....on street tires! Remove the factory rev limiter ( set at 6125 RPM for warranty reasons), throw a set of stickys on and put good driver in it and bam.....12.90s....end of story.....it's time for bed
It's not really all that far off actually and based on sound physics, John. The problem comes when guys think they have 110% VE from their motors and expect the carb to come alive at all rpm's even though the primary boosters and/0r throttle plate bore) are sized way too large for their combo. A good motor and gear combo can make a bigger carb come alive and end result in greater power.
For a street car it's probably close but like you said with a more race setup with gears etc. more carb normally results in quicker ET's. At least in every car I've seen at the track with a carb that's "too big".
Yes, you are correct, my question was about the way they rate carbs based on cubic inch size AND according to then AND some on this board a given engine can only take in a given amount of flow (cfm) and for a 302 that should be around 500 cfm........I personally know that our motor has no problem inhaling all a 750 cfm can throw at it...soooooooo what I have learned here is cubic inches has very little to do with carb size...thanks to all............p.s. if you say your car runs what you say I believe you, I have already seen first hand what our motor will do with heads, intake, cam, carb and a stall with 4:11's, I'm really interested in getting it to a track soon...................BTW, the kiddo started driving the car to school yesterday, he is DA MAN, not just with students, all the teachers and even the principal came out just to listen to it, then told him "Sam, I know your going to behave yourself, right?" LOL
LOL, I'll respond to this one last time as to WHY, WTF am I building a car as a first car for my son? Well I'm unsure where or how things are where your from but as I stated before my first car was a 1966 Ford Fairlane GT with 390, toploader 4 speed that I bought from a older man who had done exstensive work on that 390, when I bought that car I didn't even have my DL, just a learners permit, had my 18 year old cousin drive me in it for my road test portion..the look on the state troopers face who had to ride with me was PRICELESS, as he puts his seatbelt on while the cam is shaking the whole car.......he had me make 4 right turns around a block, then as he signed off on my PASS, he said and I quote "son two things, you have been driving this car alot to be able to handle it so well AND your going to get into ALOT of trouble" he was right on both accounts! I became a very skilled driver and was known very well in central Arkansas as the car not to mess with...never once was involved in a accident (by the grace of God) because I sure pushed it, some people are naturally born with cordination skills that makes them very adept at picking up driving skills, I was one, my son is another....hell back when I was a teen you were no one if you and your dad didn't build your first car together and it be a hot rod, not so today and sad indeed, it matters not the car as much as the ability and integrity of the kid at the wheel as how much power the car has, hell most all the kids his age are driving cars that will surpass 130 mph, my son's car goes 0 to 60 in a flash and the thrill is over and it's time to slow it down because of that quickness he doesn't need to push to top speeds for a thrill, he get's his in seconds whereas others wanna gopro their speedometer showing 130, 140, etc. LASTLY these comments about "I love my kids I would never put them in that" ROFLMAO, I love my kid more than life itself and that's exactely why I built this car for him, he is driving to school in it now and is a hit with not only students but the faculty.....he doesn't even need get on it, the timeless sound of that loping cam is all it takes, and he drives slower that most all other traffic (mainly because the 4:11's behind the C4) and he gets one full tank of gas every two weeks and has to make it last, oh and he picks up another kid to take to school and the kid's mom gives Sam $15 a week to take him and carry him home(an extra 3 miles a day out of his way)and those parents have known Sam since he was in kindergarten and they trust their beloved teen with him in that car....I submit to those who are implying that they LOVE their kid so much and that I must not LOVE mine to do that, you should question is it maybe you don't TRUST your child enough or maybe you don't love them enough to spend the money AND mainly the TIME with them to commit to such an undertaking....this is my last response in regard to this issue from me, if you want to help me when I ask a car related question I greatly appreciate it, however if it's about loving our kids, go look into the mirror and ask yourself the really hard question....and be honest with what the man in the mirror say's...........................Thanks to all, we are still having a blast with this car, it's funny now that he is driving it I miss coming home seeing it and knowing he will be out shortly to work on it.......still has plenty work, interior and paint but hey it's mechanically sound and he want's to drive a while.........without Dad, lol
From what I've learned over the years, not as many as some of you , is that the cfm rating isn't the crucial part you need to worry about. The whole point of the carb is to deliver gas and let air in. The engine is just an air pump and will only suck as much air as it can. The key is to jet it properly. If you put a 1000cfm carb on it, doesn't mean it will be getting too much air! Might be jetted too big out of the box and that would have to be changed. If forced induction was introduced, then there would need to be a lot more consideration I'm assuming. On a side note Samsdad, I think it's awesome that you built your son a car! Especially since he helped build it as well. That experience will teach him a lot and he will most likely respect cars more than some kid who was just given a car.
I've always wondered, if cfm was such a big deal, why are all these new fuel injection throttle bodies all 900 cfm plus?
Thanks for the kind words and yes, you are correct he has an appreciation for that car unlike many who have been given a new $30,000 car.......moreover he put that motor together from bare block to completion with my guidance and understands the internal combustion engine very well now, moreover he can diagnose and fix just about any minor problem on the side of the road with a few wrenches, screwdriver and hammer, oh and duct tape, lol. Many today can't even check the oil let alone understand the importance of that oil and what it's doing or how to change a flat tire..............anyways I think I have gained enough of an understanding about carb size now thanks to the input of many to know that those calculators are merely a very very basic starting point for a very very basic stock engine and on this board it should be a crime to even mention what a CFM calc says because I don't think it applies to anyone on this forum...good day!
