Ordered a new cam today for the W2 408

-
mbaird said:
If this does work my assumption is the 106 offsets the duration and then some .
Cpearce are you running Holleys ?
I rigged up a few 1405 Eddies for mine .
Click to expand...
Both cams are on the 106, trying to fool engine into thinking it has more compression than it does at 10.12:1, and 3000ft elevation. It is a pair of 1905 AVS 2 650's. Also have a pair of 1902 primary boosters coming to reduce the volume if this proves to be too much. I know some guys cringe at these carbs for tunnel rams, but I will try.
 
cpearce said:
J.Rob, fair, I know you have run quite a few tunnel rams on various engines. You don't agree they increase the rpm capability due to increased air flow? Not a pointed question, wishing to learn from your experience. I am curious, what are your thoughts on my cam choice?
Click to expand...

Longer runners lower torque peak--just look at the cross ram stuff which is a tunnel ram laying down. The CSA and cylinder head characteristics dictate RPM first, camshaft/valvetrain second. That being said--W2 heads are very RPM capable-you will have no trouble. No comment on the cam I'll leave that to the cam grinder. J.Rob
 
RAMM said:
Longer runners lower torque peak--just look at the cross ram stuff which is a tunnel ram laying down. The CSA and cylinder head characteristics dictate RPM first, camshaft/valvetrain second. That being said--W2 heads are very RPM capable-you will have no trouble. No comment on the cam I'll leave that to the cam grinder. J.Rob
Click to expand...
Thanks, the tunnel ram is new turf for me. As for the cam, I respect your discretion.
 
cpearce said:
Well today I ordered a new cam for my W2 408.

W2 408 build

The engine has treated me very well, but I always felt I had left quite a bit on the table. The engine pulls very hard, but I was limiting the RPM to 6200 max for safety due to the hydraulic roller setup. I have decided pull the juice roller out, and simplify things, with a solid flat tappet cam. I spoke with several grinders and decided upon a custom grind from Bullet Cams.

The new stick is single pattern, with the following lobes.

280 advertised, 251@ 0.050, .371 lobe lift (1.6 rockers), 106LSA, .013 lash.

Having a good idea of what I was after, I had Chris, at Bullet Cams help me with the details. I asked for lobes with a degree of intensity that would take advantage of performance, but not beat up the valve train, as the car does see a lot of street miles. Although the idea was to allow me to run the RPM up a little more on the top end, Chris feels this cam will make more power all over. (@Rat Bastid) I took your advice on mentioning I may put a tunnel ram on in the future, Chris indicated this shorter duration cam would be a great compromise for either single plane or tunnel ram. The single pattern, combined with 106LSA should prevent me from having to RPM like mad to make the tunnel ram work. I figured you may like the single pattern also, LOL. Cam is 10 weeks out, likely will be a winter swap out. I'll post the current cam card for comparison.

View attachment 1715938430 View attachment 1715938431
Click to expand...
If you like the hyd cam you have now and all you want is more rpm, just swap out the hyd rollers for a set of solid rollers.
The pushrod length will be longer and you may want a heavier spring.
 
The Holley Tunnel Ram doesn’t really have very long runners. Can you measure them & vs what you were running? I only have the MP Tunnel Ram version I can measure.
 
@cpearce Sorry about your Oilers ...
I was hoping they would win to extend the series. Smith was a bit off his game it seemed .
 
Chris at Bullet is very good at coming up with a cam for all different kinds of combos, he is the only one i talk to at Bullet, and that is all we use for cam grinders anymore.
 
512Stroker said:
If you like the hyd cam you have now and all you want is more rpm, just swap out the hyd rollers for a set of solid rollers.
The pushrod length will be longer and you may want a heavier spring.
Click to expand...
Careful there, from what I understand, not all HYD profiles will take a solid roller.
 
Bakerlite said:
Careful there, from what I understand, not all HYD profiles will take a solid roller.
Click to expand...
And I'm going flat tappet to simplify things, not further complicate. I've seen the results of a roller lifter failure.
 
Bakerlite said:
Careful there, from what I understand, not all HYD profiles will take a solid roller.
Click to expand...
You do need to be curious
The cam manufacture can tell you if the cam profile is compatible, in my case it was, it's all about ramp speeds. Many members have done this successfully, Yellow Rose was the one who got me going on it.
 
Made one small spec change today, LSA from 106 to 108. This was done for the fact it is a 4 speed with a light flywheel, this and fine tuning should help dampen the pulses at low rpm in 1st gear. With the current cam, it occasionally started to buck in parking lots, requiring the feathering of clutch.
 
cpearce said:
Made one small spec change today, LSA from 106 to 108. This was done for the fact it is a 4 speed with a light flywheel, this and fine tuning should help dampen the pulses at low rpm in 1st gear. With the current cam, it occasionally started to buck in parking lots, requiring the feathering of clutch.
Click to expand...
Tight 108-106, etc…. will do that. That’s why the after market makes cams at the 110 for automatic and manual cars alike.
 
I dont get any bucking.
246/250 on a 108 and a 20lb Mcleod flywheel . 3.55 gears and an 833 with normal first ... not 3.09.
 
mbaird said:
I dont get any bucking.
246/250 on a 108 and a 20lb Mcleod flywheel . 3.55 gears and an 833 with normal first ... not 3.09.
Click to expand...
That is good news, I was getting a little bit at very slow speeds with 3.23 and 3.09 first. I thought my flywheel was 18lbs by memory, but it has been a while since I looked, could be 20. Might also be the 23 degrees initial timing. Also changing to 3.73 gears.
 
cpearce said:
That is good news, I was getting a little bit at very slow speeds with 3.23 and 3.09 first. I thought my flywheel was 18lbs by memory, but it has been a while since I looked, could be 20. Might also be the 23 degrees initial timing. Also changing to 3.73 gears.
Click to expand...

Could be 18#s... Iam running 16 initial then it ramps up at 1200 rpm . I have a digital advance curve . Could be that .
 
A few things can cause bucking/surging. Too much timing, lean mixture.
Widening the LSA is the wrong way to reduce overlap; you reduce duration & keep the correct LSA.

D. Vizard has a veeeeeeeeeeeeery good you tube on this titled Fords 303 cams; sorry, do not know to link it, maybe somebody can.
 
Bewy said:
A few things can cause bucking/surging. Too much timing, lean mixture.
Widening the LSA is the wrong way to reduce overlap; you reduce duration & keep the correct LSA.

D. Vizard has a veeeeeeeeeeeeery good you tube on this titled Fords 303 cams; sorry, do not know to link it, maybe somebody can.
Click to expand...

This?
 
I have no dog In the fight, but imo that’s another Vizard video that is hard to watch. He states what he is saying is fact, and it may be, but provides zero actual data to back up the claim. Show us some freakin numbers to back your claim.
 
TT5.9mag said:
I have no dog In the fight, but imo that’s another Vizard video that is hard to watch. He states what he is saying is fact, and it may be, but provides zero actual data to back up the claim. Show us some freakin numbers to back your claim.
Click to expand...

I think David may be in early stages of dimensia. He seems to have a hard time completing thoughts .
 
That’s very sad to hear. Hopefully it is not the case. Although I would like him to show maybe a dyno graph or two of back to back A to B comparison testing like Richard Holdener does. It puts credence to the claim.
 
To me bucking would seem more of a gear ratio/converter problem then lobe separation angle thing.
 
K.O. SWINGER said:
To me bucking would seem more of a gear ratio/converter problem then lobe separation angle thing.
Click to expand...
The choppy idle of the 108-106-etc and not enough gas is the issue. Same as a stock engine would do but more violent and cranky. It just takes a hot minute to figure out and forget about it.
 
rumblefish360 said:
The choppy idle of the 108-106-etc and not enough gas is the issue. Same as a stock engine would do but more violent and cranky. It just takes a hot minute to figure out and forget about it.
Click to expand...
Yeah somewhat but too tall of gear with a hi duration camshaft will also be a cranky setup equals bucking
 
You must log in or register to reply here.
-

Back
Top