[NeighborsComplaint]

Since you're in deep enough to change the cam timing, why not just get the 2802 or other cam of your choice and swap it in?

[1968GTO421]

I,too, have budget problems, but I believe I would just go the few extra bucks and get another Voodoo 702 since the engine ran well with it previously and all the carb/ignition settings were set for the 702. Should resolve these problems. Just my 2 cents.

[lfdsteve]

Originally Posted by Cliff R

Steve, good question.

Many years ago I stumbled on to a HUGE supply of distributor springs, as well as a butt-load of NOS 2GC, Monojet and Q-jet parts.

I have also purchased hundreds of distributors over the years for parts.

I'm actually starting to run a bit low on springs, and center cams/weights for HEI's. Even so we don't advertise distributor work, PLENTY busy with other things, but we still do one or two a month.

We are finding that most HEI's will have wear at the pins and weights, so we're frequently having to replace the pins and braze the weights up and re-drill them to size. I actually like doing them in that manner vs using the whimpy plastic/Teflon bushings the factory used in many of them. I haven't had a single HEI repaired in that manner wear at all as the braze provides a nice bearing surface against the hardened steel pins......Cliff

Excellent. Will be disassembling my hei this winter while heads and intake are at Daves. Plan will include examination and correction of weight pivots as well as limiting modifications.
So just need a source for a reliable adjustable vacuum can and spring. Not lucky enough to find a cache of originals. Any sources for "second best options "?

[455rebel]

still ant got it ready to run, getting ready for spook night with my 6year old son has taken more time than I thought , might get it running one night this week.
as always thanks.
looking at the cam specs 702 vs 2801, damn they look real close, they should run pretty close in my old eyes, or am I missing something???

[72LuxuryLeMansLa.]

Originally Posted by 455rebel

still ant got it ready to run, getting ready for spook night with my 6year old son has taken more time than I thought , might get it running one night this week.
as always thanks.
looking at the cam specs 702 vs 2801, damn they look real close, they should run pretty close in my old eyes, or am I missing something???

702: Advertised Duration (Int/Exh): 262/268

2801:Advertised Duration: 288 int./298 exh.

Not EVEN close!

[455rebel]

Look at the @.050 specs
Lift
Lsa
Not the adv dur.

[72LuxuryLeMansLa.]

Originally Posted by 455rebel

Look at the @.050 specs
Lift
Lsa
Not the adv dur.

You MUST look at the Advertised Duration also. All of these things count. These are two VERY different cams.

[Blued and Painted]

Don't supose the cam is a tooth off. Just fishing.

Personally saw a honda Quaalude burn holes in the pistons when the t-belt was installed incorrectly

[pastry_chef]

Originally Posted by 72LuxuryLeMansLa.

You MUST look at the Advertised Duration also. All of these things count. These are two VERY different cams.

Yes, exactly correct!
Why they performed differently.

[455rebel]

I thought when comparing cams u always looked at the @.050 to compare!
maybe ive been missled .
someone please explain adv dur in short vs dur @ .050

[tooski]

Originally Posted by 455rebel

I thought when comparing cams u always looked at the @.050 to compare!
maybe ive been missled .
someone please explain adv dur in short vs dur @ .050

From What I have learned on this forum: 2 cams with the same .050 numbers but different advertised will have different ramp rates. Shorter ramp rates (lower seat timing) are harder on the valve train and faster cylinder filling which leads to higher compression psi which leads to detonation.

[Squidward]

.050 numbers were created as a standard to compare cams from different manufacturers. When companies used advertised duration, some used .002, some used .006, etc.

Maybe Summit uses a different standard for advertised duration than Lunati. I think Lunati uses a .006 standard.

FWIW, the Voodoo cam has a faster opening ramp. Paul Carter could chime in. He uses a lot of Voodoo cams, and had personal dialog with the designer.

[pastry_chef]

As noted above many different manufacturers choose to rate "advertised duration" at different points.
Generally .006 tappet lift is the most common.

Yet the catalog numbers advertised do not tell the whole story.

Like cylinder heads, with cam lobes I like to look at the pedigree of a lobe design.

Harold Brookshire who designed the Ultradyne and Voodoo lobes was one of the best ever.

Mike Jones is another great.
http://jonescams.com/hydraulic-flat-tappet/

Some lobes may be lazy, others too aggressive.
A great designer is your best crack at just right.

[HWYSTR455]

Originally Posted by lfdsteve

Always great information and advice Cliff so a question. If you prefer the original distributors over aftermarket, and the rebuild/re curve kits are "junk" Where would someone like me get parts that are appropriate to recondition an older unit? Obviously the weights dont go bad. Where would I get springs ect?
thanks as always!
Steve

I believe at one time SunTuned made a batch of OE type weights, maybe PM him, see if he can help. He can also advise on which springs to use, he's pretty much tested them all.

.

[455rebel]

[QUOTE=Squidward;5650622].050 numbers were created as a standard to compare cams from different manufacturers. When companies used advertised duration, some used .002, some used .006, etc.

Maybe Summit uses a different standard for advertised duration than Lunati. I think Lunati uses a .006 standard.

This is why I compare @.050
Looking at these numbers they do look similar. Not exact but in the same ball park.

Progress has slowed to a crawl.
Timing cover on, fuel pump on, water pump on, installed ballencer last night,when bolting pulley to ballencer , noticed a buggered up thread in one of the 4 bolts that hold it on, retapping that tonight.
Got all 8 plugs cleaned and installed. Still got ps and alt to mount and oil change.
Single dad with 2 kids at home, and run my own business has to come first.
Should have it running and a new compression test by weekend.
As always thanks.
I'm betting the cam advanced (my bad) was the issue!

[TedRamAirII]

[QUOTE=455rebel;5650993]

Originally Posted by Squidward

.050 numbers were created as a standard to compare cams from different manufacturers. When companies used advertised duration, some used .002, some used .006, etc.

Maybe Summit uses a different standard for advertised duration than Lunati. I think Lunati uses a .006 standard.

This is why I compare @.050
Looking at these numbers they do look similar. Not exact but in the same ball park.

Progress has slowed to a crawl.
Timing cover on, fuel pump on, water pump on, installed ballencer last night,when bolting pulley to ballencer , noticed a buggered up thread in one of the 4 bolts that hold it on, retapping that tonight.
Got all 8 plugs cleaned and installed. Still got ps and alt to mount and oil change.
Single dad with 2 kids at home, and run my own business has to come first.
Should have it running and a new compression test by weekend.
As always thanks.
I'm betting the cam advanced (my bad) was the issue!

How far advanced was it?

[455rebel]

[QUOTE=TedRamAirII;5651028]

Originally Posted by 455rebel

How far advanced was it?

I have a 3 key crank sprocket, adv, straight up, and retard. It was in the adv key so I put it straight up.
When checking the timing on the ballencer, it moved bout 4 deg.
From 8btdc(before sprocket key change) to 4btdc(after).

[455rebel]

ok, drove it last night late without changing initial timing, thought it was at 8btdc but after checking it , it was 4btdc, because I changed the cam timing. set it on 12btdc for next test drive. heck it ran pretty well on 4btdc, must be all the torque, its hard to tell minor tuning improvements by the seat of the pants power meter!!!

[455rebel]

Runs ok on 12btdc. No ping. Going to leave at 12 till I can get it real hot and be sure.
Then back to the dist springs.
Car isn't any faster or quicker now that I can tell , but it seems to run better or smother than when advanced. Try to get a compression test this weekend.
Thanks

[steve25]

When any motor is pinging your loosing power, period!