Ordered a new cam today for the W2 408

[cpearce]

I really don't think I am going to lose

Yeah somewhat but too tall of gear with a hi duration camshaft will also be a cranky setup equals bucking

I have a 3.09:1 fist gear transmission, that coupled with 3.23 ring and pinion is about equivalent to a 3.73 gear. Not super deep, but not really tall either. The narrow LSA creates stronger pulses down low due to higher cylinder pressures.

 

[K.O. SWINGER]

I really don't think I am going to lose

I have a 3.09:1 fist gear transmission, that coupled with 3.23 ring and pinion is about equivalent to a 3.73 gear. Not super deep, but not really tall either. The narrow LSA creates stronger pulses down low due to higher cylinder pressures.

Yes it does and I am a fan of tighter lsa's but it only goes so far if the gear ratio is not a good match kind of more of a fine tune in my opinion.but with 373 ratio should be good to go.

 

[cpearce]

Yes it does and I am a fan of tighter lsa's but it only goes so far if the gear ratio is not a good match kind of more of a fine tune in my opinion.

And the 18lb flywheel I have vs. a 30lb one is also a contributor to the low speed surge, but I can assure you it is fun when you get on it!

 

[K.O. SWINGER]

Yes I kind of miss read your post I have ran 323 with some pretty gnarly cams most of the 108 variety one with a 110 with a 4 speed which is much more forgiving. first and second we're very strong but it seemed like third and fourth were too long and just not a great match.after I went to a 391 game changer. I also ran 354 with a 25 inch tire which was just a really strong all-around gear. But my experience is with a little 340 not a 4-in stroker kind of apples to oranges.but I will say with my 323s I could do 90 in3rd gear and that can get me in a whole lot of trouble.

 

[B3422w5]

I really don't think I am going to lose

I have a 3.09:1 fist gear transmission, that coupled with 3.23 ring and pinion is about equivalent to a 3.73 gear. Not super deep, but not really tall either. The narrow LSA creates stronger pulses down low due to higher cylinder pressures.

not sure how you are figuring that. Short first gear will hit the tire harder( might be good, might be bad depending on the chassis) but it also lengthens other gears, doesn’t it?
3.23 is a tall gear, period, nothing about first gear is gonna change that
Putting a low gear set in a 904 helps some cars too… but the spread can also be detrimental to others
It’s always a tradeoff

 

[cpearce]

not sure how you are figuring that. Short first gear will hit the tire harder( might be good, might be bad depending on the chassis) but it also lengthens other gears, doesn’t it?
3.23 is a tall gear, period, nothing about first gear is gonna change that
Putting a low gear set in a 904 helps some cars too… but the spread can also be detrimental to others
It’s always a tradeoff

I may have not been super clear, sorry. I currently have 3.23 gears, and 3.09 gear transmission. I am swapping in my 2.66 first gear transmission and 3.73 gears. First gear currently is almost equivalent to the 3.73 gears, but yes, gear spread is wider. This is not an od trans by the way, it is a 3.09 first, 1:1 4th transmission.

 

[mbaird]

Cpearce and I run 4 speed manual tranys so no torque convertors. 106/108 cams will always have more low rpm pulsing than 112/114s.
B Running a low gearset you get into higher rpms and into a smoother part of the powerband at low speeds .

 

[Bewy]

And the way to reduce 'bucking' is explained in post 41.

And it is NOT to widen the LSA. Unless you want to lose hp that you don't need to lose.....

 

[cpearce]

Well, I caved to the peer pressure like a school kid, lol. After much debate, and installing some steeper gears, I have contacted Bullet and asked them to revert to the original plan of 106 degree LSA.

 

[mbaird]

Well, I caved to the peer pressure like a school kid, lol. After much debate, and installing some steeper gears, I have contacted Bullet and asked them to revert to the original plan of 106 degree LSA.

So what will the lift and duration be ?
My W2s flow best around .650 lift . What does your flow curve look like ?

 

[Demonx2]

FWIW - my 408 has a SFT Bullet cam also. I worked with Kurt there. 10.5CR, mild ported Eddies, Super Victor, and 850DP. The cam is 251/255@050, something like .557/.567 lift, on a 106 LSA. Lobes were for the "middle" lifter diameter so to be a tad easier on the valvetrain (think that is the Ford lifter diameter?). Anyhow, you won't be sorry with that LSA. Mine's an auto with an 8" TC that stalls at 5000 rpm but on the dyno, the engine made a tad over 500 #-ft as low as 3500 rpm. Not enough cyl head to wind it out much past 6200 but I like the cam and suspect you will too! 4.10 gears going in the car to replace the 4.56's next month!

 

[B3422w5]

FWIW - my 408 has a SFT Bullet cam also. I worked with Kurt there. 10.5CR, mild ported Eddies, Super Victor, and 850DP. The cam is 251/255@050, something like .557/.567 lift, on a 106 LSA. Lobes were for the "middle" lifter diameter so to be a tad easier on the valvetrain (think that is the Ford lifter diameter?). Anyhow, you won't be sorry with that LSA. Mine's an auto with an 8" TC that stalls at 5000 rpm but on the dyno, the engine made a tad over 500 #-ft as low as 3500 rpm. Not enough cyl head to wind it out much past 6200 but I like the cam and suspect you will too! 4.10 gears going in the car to replace the 4.56's next month!

bet you car would be quicker with either a Victor( for sure) or an airgap( maybe, but most likely)
Super Victor has a huge plenum, and without porting work is actually a slug, unless a person has a good bit of motor.
Buddy years ago ran a stroker B1BA combo, that was pretty healthy. Ran 9.05- 9.09 ish in good air in the 1/4…super light chassis car. Like 2350-2400 pounds, Black Cuda. They still race it, but big Best Machine big block now. Runs 4.90’s in the 1/8 on motor.
Swapped on a super Victor and best it ever ran was high teens.