Next step for my 350

So this cam doesn't work as well at 112? With what has much higher dcr ? I would understand that Steve has his preferred setting. My timing set only has 0/4/-4 and also just trying to understand why so far retarded and the effect before I pull the TA 310 from my convertible and swap the 2700 stall/3.73 gear for 2000 stall/3.42. I assume the setup works fine at 112 .

 

I never use the intake centerline method. I use the valve opening and closing points. Installed straight up, no advance/no retard the cam was spot on to the cam card. I retarded it 6* originally and never should have removed it. Hey you don't know how much is enough until you go too far. It is now exactly as it was before.
And yes I use a degree wheel. A REAL degree wheel. Those other things are junk. Also note the 4 decimal place dial indicator.

Engine run stand is almost complete. Hope to fire it up Sunday.

Also changing the cam a few degrees either way only shifts the rpm range 100-200 rpm. It's not a game changer as some would lead you to believe. I already have more than enough torque so was trying for a little more HP on top.

 

Not even close. Not sure why. Card would not scan the typed in numbers.

at .050" lift;
intake opens -3ATDC
closes 33ABDC
exhaust opens 46BBDC
closes -6BTDC

Oh I see your data is from seat to seat.

 

If you set your cam at those cam card specs, it is sitting at 4* advance, even in the 'straight up' position (timing dots lined up).

To keep things simple, understand that the cam is simply turned 4* advanced with the dots lined up. It's not machined into the lobes, it's machined into the cam end where the gear bolts.

This is the recommended setting from Crower, and sits at this position by default when using a standard timing gear set.

As Paul mentioned, the cam may be a bit off. As to how far, ask Crower how accurate their cam specs are and if it's safe to install it this way. The cam card suggests it is.

If you install it 6* retard, it will sit 6* from this default position based on the cam card specs, which means ICL should sit around 114*, as mentioned by me earlier.

Since you do not measure it this way, find out where your Intake Valve Closing point is at advertised to calculate dynamic compression ratio.

If you simply retard it 6* from where you show on the cam card, you should sit at 72* IVC point (66 default + 6 =72).

With the data you provided, a static compression of 9.9:1 comes out to roughly 7.45:1 dynamic with a 72* IVC point, which is a safe zone for 93 octane fuel and some extra cylinder fill via VE and some scavenging, according to my calculations based on this data.

If it's sitting at 118*, your DCR will be as Larry said earlier, which gives a ton of leeway on spark advance and pump gas grade/quality. You could even run lower octane fuel (91 would work) without too much advance this way.

Check your degreeing wheel and see where you are.


Gary

 

I AM 6* RETARDED FROM THE CAM CARD NUMBERS. Not screaming just forgot caps lock was on.

 

Card says 33 ABDC, actual is 39 ABDC

 

Then advertised should be sitting somewhere around 72*.

"Advertised" is loosely translated to .006. It (actual valve closing point on seat) could be anywhere from 69-75 in all likelyhood, depending on how accurate Crower grinds their cams (and assuming symmetric lobes).

In either case, You're good on 93 pump.

Gary

 

His .050 specs (on cam card, and he sits it 6* retarded from THIS) is sitting in a 4* advanced position by default. It's incorporated into the cam this way by machining the gear holes on the end of the camshaft to be sitting offset by 4* advance when you line up the dots on a typical timing gear.

This is what is meant when they say the advance is 'built into' or 'ground into' the cam.

Your .006 specs are at 112/112, or 0*/0*, which is actually 4* retarded from the .050 specs Steve gave.

His cam is technically sitting at 2* retard from a true 'straight up' position.

Type in 114 on your ICL box on your calculator, and you'll see where his intake lobe is sitting, when he advanced it 6* from the .050 specs (72*).

Better yet, type in those .050 specs into your calculator, and you'll see the ICL is at 108*. Now do what Steve said he done, and add 6* to this...

Where does it now sit? At 114* ICL, which gives a 72* closing point @.006, or a 7.45:1 DCR for the 9.91:1 SCR.


Gary

 

When cam card says at .050 that means lobe lift right not total lift? Just got my Crower lvl3 from summit..

 

Got the run stand built and fired it up today. Sounds good and tight. Plan to run for a few hours then put on a dyno.

 

That's a heck of a nice rig you have there!

 

Super nice looking engine stand there Steve! :TU:

 

Pretty sweet, Steve!!! Nice run stand, I need to make adapters for sbb motor mounts for mine, maybe later this year?

Anyway I wanted to call you today to take a ride out to Dave's but he was way to stressed out from trying to get things done and people showing up all day so maybe next weekend if you're around and Dave isn't so stressed out and I have the energy?

This would of been the perfect weekend for me because I got Friday and Saturday off and was rested enough to make the 30 mile journey.(LOL, the new job is still kicking my butt!)

I'm thinking the people were showing up there today because it is a holiday weekend and had the energy to show up today because of that with this Saturday being the day to do what people wanted to do because Friday and Sunday is more of family days, like I was thinking.

Oh well, if you're up to it next weekend and Dave is I'll force myself to be up to it if I'm not sent out of town for work.



Derek

 

Derek, give me a call. I would like to go.

Stand will go out for powder coat after the engines off. Can clean up the wiring then also.

 

Someone wanted to see my 16cc dish Autotecs.

The red block has 13.5 cc dish and the unpainted has the 16cc dish.

 

Got about 1 1/2 hours run time so far.

65psi oil pressure cold @ 1800 RPM, 25 at hot idle. 18 inches vacuum @ 600 RPM.

Ready for the dyno.