Totally not gun related..race car stuff.

[a6mmbrman]

This is a pre sb2 small block that Charlie Helvey built while with Morgan Mcclure racing. This one made 813hp at 8,200 on alcohol but it was 421” still amazing to see what all they came up with.

 

[AlNyhus]

Thats really impressive power for that size engine. My last sbc was 13.5 to one and I had to get it cranking with the ignition off or it would kick back, Id bet 18 to 1 would blow the starter off the block. What kind of fuel you running in it? I would bet theres a lot of overlap in the cam that bleeds a lot of pressure. A buddy had the idea that he would reduce the overlap on his cam and time it to maximize cylinder pressure. Blew the crank through the main caps on the first run Racing was fun but rifles are so much cheaper. Miss it, but not really.

Alex, because the combustion chamber is so efficient, it doesn't need a lot of ignition lead. Those numbers were at 30 degrees total timing.
Intake lift at the valve is 1.020" and the exhaust lift is .980". Spring pressure is 975 lbs open and 500 lbs on the seat. With that much spring, you actually have to be darn careful turning the engine over manually with a breaker bar...it will gallop off the springs and whack you hard enough to break your wrist...even if the breaker bar doesn't get you.

Kind of like leaving the key in the lathe chuck and turning it on...darn serious stuff. -Al

 

[Alex Wheeler]

Thats pretty interesting. That not a lot of advance at all. I didnt really think of how the combustion chamber design would play into the amount of advance you would need to run but it makes perfect sense.

 

[a6mmbrman]

Al, this is bringing bad thoughts in my head again. I’ve got a Camaro in the basement that I thought I’d just leave alone for once. Lmao I can’t leave anything alone. It looks like hot rods and rifles bring together the same people. Good thread Al!!!

 

[Adam in WI]

Guys probably wind up being rifle loonies when they realize they can't afford all the crap they want to do to their hotrods

 

[Toolbreaker]

@AlNyhus that is seriously cool stuff, and wild numbers from a naturally aspirated small block . What type of ignition system is that? I'm assuming a crank trigger of sorts?

 

[AlNyhus]

@AlNyhus that is seriously cool stuff, and wild numbers from a naturally aspirated small block . What type of ignition system is that? I'm assuming a crank trigger of sorts?

Yes...MSD crank trigger and a front mounted distributor that's belt driven off the Jesel cam drive. The oil pump is a Daily Bros. external unit and the vacuum pump is a massaged Star Engineering unit. It will pull nearly 14" of vacuum at WOT...enough that you have to be careful not to let the underside of the pistons get dry and stick a wrist pin.

 

[std7mag]

Alex, because the combustion chamber is so efficient, it doesn't need a lot of ignition lead. Those numbers were at 30 degrees total timing.
Intake lift at the valve is 1.020" and the exhaust lift is .980". Spring pressure is 975 lbs open and 500 lbs on the seat. With that much spring, you actually have to be darn careful turning the engine over manually with a breaker bar...it will gallop off the springs and whack you hard enough to break your wrist...even if the breaker bar doesn't get you.

Kind of like leaving the key in the lathe chuck and turning it on...darn serious stuff. -Al

That's why i spent the money on one of those long 1/" drive Snap-on rachets.

 

[WayneShaw]

From a young punk back in the 70's and 80's trying to squeeze out a few HPs and making it all hook up, and reading all this along with Jackie's posts, what a change!!!! It's amazing.

 

[Tommie]

Guys probably wind up being rifle loonies when they realize they can't afford all the crap they want to do to their hotrods

Man that’s the truth! Switching from hotrods to firearms was like getting a big pay raise.

 

[SG4247]

Im still doing both firearms and hotrods.

Last NA big chevy I built made 1.82 hp/cuin at 582 cuin with a single plane intake, and conventional heads.

Helped my buddy with a SBC Max effort deal that made 885hp at 461 cuin. Alum Dart block, sheet metal intake, two giant TB’s etc..never would stay together. Sleeves moved in the block. Scrapped the project but man did it sing.

 

[jackieschmidt]

Wow, Al, I didn’t think there was any gasoline that would handle 18-1 without some type of water or meth injection.

 

[PRR1957]

My poison was a 632” with cold air lungs riding beside me. It was my advertisement for Davis Custom Rifles. Hahaha

Is that drag car a Por Mod, and does have nitros ?

 

[AlNyhus]

Wow, Al, I didn’t think there was any gasoline that would handle 18-1 without some type of water or meth injection.

The VP C25 and Sunoco SR18 will do it, provided the combustion chamber is very efficient and there's not much, if any, dome on the piston. With a more traditional setup (big chamber and dome), you have to look to the oxygenated fuels like VP C45. They're a mess to deal with due to the low BTU's generated below peak torque and the fact that you have to herk around the air bleeds pretty hard to get around that. Yuk!!!

 

[a6mmbrman]

Is that drag car a Por Mod, and does have nitros ?

Around my area it was called big dog class. I ran 4.70 and 4.90 index mostly at my local track. And yes it had nitrous but I never ran the nitrous out the back door. It would run lower 60’s on a very safe tune.

 

[AlNyhus]

A few of the ones that have been on the dyno lately:

283-220 SBC Super Stock engine:

440" SBC splayed valve:

Ford 302" Coyote Super Stock engine:

SBC '94 265" Super Stock engine:

SBC '55 265" Super Stock engine:

BBC 565":

 

[Alex Wheeler]

What kind of numbers are those ss engines putting out? I was always most impressed by the stock and super stock engines. Amazing what kind of numbers guys could get out of those things.

 

[AlNyhus]

I was always most impressed by the stock and super stock engines. Amazing what kind of numbers guys could get out of those things.

Alex, the Stock and Super Stock stuff is what I love working with. When you're that limited on power, everything counts...we go to some pretty extreme lengths to find another 2-3 h.p. and a bit more torque.

This is a very recent 283-220 for an NHRA Stock Eliminator K/SA '66 Nova. Big power but it developed some big issues on the dyno. All the pieces stayed inside and it's fixed now and back making good power.

This is the 327-275 from my G/SA '68 Chevy II Stocker. In this series of tests, we were working in the oil pan and trying some ideas about reducing pumping losses and balancing the bay-to-bay pressures inside the crankcase. For example, since we have to run a stock or NHRA accepted stock capacity oil pan, venting the oil pan from the fuel pump area into a catch can with a large diameter -12 line made the engine 'think' it had a bigger capacity oil pan on it. The instrumentation I plumbed into the plate on the fuel pump area confirmed this. And It made a bit more power and torque. This lead us to further work with the oil pump, which also picked up the power. At the end of this series of tests....48 pulls in all....the engine came off the dyno making 16 h.p. more than when it went on. Not a single part was changed..just working at this and that...picking away at whatever crumbs might be available. The car ended up going a best of 10.94, which is -1.06 under the NHRA 12.00 index for G/SA.

 

[PRR1957]

Around my area it was called big dog class. I ran 4.70 and 4.90 index mostly at my local track. And yes it had nitrous but I never ran the nitrous out the back door. It would run lower 60’s on a very safe tune.

Big Dog Class. I like that.

Your car looks totally bad ass. The orange and black paint really adds to the overall appearance.

I’ve been a Blue Oval fan ever since I was a kid, but not so much as of late because of Ford’s Pro Leftist stance, but anyway, I always did like that particular body style for that generation Camaro. A number of years ago I watched a video about a Standing One Mile event where some guy used the same body type of Camaro and ran over 240 MPH. I don’t remember what size engine was in it. The cars stock body had only been lowered with the addition of a splitter in front and relatively small low mounted wing on the end. It was also factory painted in my favorite shade of a dark green. I guess I’m becoming a Bow Tie fan.

 

[Adam in WI]

I guess I’m becoming a Bow Tie fan.

I went through the same dilemma. I didn't want another Ford, so I bought a GMC to avoid that dirty feeling of driving a Chevy.