Big Block Gear Drive On A Slant?

-
Killer6 said:
Last time I saw the post on .org, Oregon Cam Grinders had something like 10 roller cam cores left they were selling off w/or w/o being ground, they weren't planning on any more IIRC..........
Click to expand...
Yeah, it' a pretty narrow niche market at best. I started a thread over there back in 2010 about roller cams and there have been numerous ones since then. I doubt in total there hasn't been many made and fewer that have actually found there way into running engines in that time.
 
RustyRatRod said:
He has some top secret none of your business information.
Click to expand...

37F1399F-98B8-4FBA-9142-12ED3F9E2D9E.jpeg
 
Killer6 said:
Not without a .org decoder ring......................
Click to expand...
If you want to hear a slant 6 with a Pete Jackson big block MoPar gear drive go to youtube and put in "Green Grenade Mo-Kan Dragway". I think the sound might be louder than an iron block with a gear drive as this sound is with an aluminum engine block.
 
How about right back on subject what do you have as far as a slant 6 timing gear?
 
j par said:
How about right back on subject what do you have as far as a slant 6 timing gear?
Click to expand...


I can't count all the /6's I've done but it's sooooo many I was bored by them. I worked where we had accounts for /6's that went into forklifts and rail car moving whatever they were. Just on /6's and Continentials I've probably set 1000 sleeves. Maybe more.

I can honestly say I've never seen a GD for a /6. Doesn't mean you can't make one. Even if you did make it, and could produce it so the average guy could buy it (I'm talking about a fixed idler 3 gear drive) you'd probably never sell enough to get the intial investment back.

I hear lots of people bad mouth gear drives, but when questioned, they've either never run them, or used a junk floating idler system like the Pete Jackson system. Those aren't as good as a chain.
 
yellow rose said:
I can't count all the /6's I've done but it's sooooo many I was bored by them. I worked where we had accounts for /6's that went into forklifts and rail car moving whatever they were. Just on /6's and Continentials I've probably set 1000 sleeves. Maybe more.

I can honestly say I've never seen a GD for a /6. Doesn't mean you can't make one. Even if you did make it, and could produce it so the average guy could buy it (I'm talking about a fixed idler 3 gear drive) you'd probably never sell enough to get the intial investment back.

I hear lots of people bad mouth gear drives, but when questioned, they've either never run them, or used a junk floating idler system like the Pete Jackson system. Those aren't as good as a chain.
Click to expand...

And why is the floating idler system no good? That's what I intend to use.
 
I saw a generic gear drive set for a 440 on eBay that includes all the bolts, bronze thrust bearing, idlers and everything brand new for $44.00. Add a $2 piece of material to make the cam gear spacer to fit a Slant and you can't get any cheaper than that.
 
RustyRatRod said:
And why is the floating idler system no good? That's what I intend to use.
Click to expand...
Nothing's wrong with them, most all other engines use the floating idlers with gear drives. Some people don't like them because they do walk forward and backward if they aren't pinched in place by the timing cover. But they don't cause problems.
 
Well, it would be simple enough make the dual idler a fixed idler since the front of the slant six block is flat. Just one more consideration I suppose. I see no problem with the dual idler, either. I've set a few up before and the timing is much more stable than a chain. When set up right, there's zero slack.
 
RustyRatRod said:
And why is the floating idler system no good? That's what I intend to use.
Click to expand...


The issue is there are two different gear sizes. When the engine is in acceleration, it has one gear (I forget which gear it is...the smaller or the bigger) that drives the cam. When you lift off the throttle (or worse yet, if it's a stick and you're at WOT and push the clutch) the other gear slides over and takes over driving the cam.

I've seen as much as 10 degrees of cam movement with this system. The usual is about 7-8 degrees. It varies from drive to drive, deck height and who knows what else. But 7-8 degrees is about the average. That's a lot.

I learned this the hard way. I did an engine that had enough P/V (because I always check) and it went out and bent some valves. After I varied I wasn't on dope when I did the first measurement, I found out it would move the cam timing a mile. Hence, the bent valves.

That's the quick of it. I've heard some unverified stuff that I don't like to post so I usually save that stuff for private conversations because I don't have the ability to test what I was told.
 
CNC-Dude said:
Nothing's wrong with them, most all other engines use the floating idlers with gear drives. Some people don't like them because they do walk forward and backward if they aren't pinched in place by the timing cover. But they don't cause problems.
Click to expand...


If they pinch in the timing cove they don't work. How would one pinch in a small block Chrysler or a Pontiac or Ford with a thick, cast cover?
 
CNC-Dude said:
I saw a generic gear drive set for a 440 on eBay that includes all the bolts, bronze thrust bearing, idlers and everything brand new for $44.00. Add a $2 piece of material to make the cam gear spacer to fit a Slant and you can't get any cheaper than that.
Click to expand...

Hush up. Don't be tellin my secrets. lol

It's gonna take more than two bucks to make the spacer I have to use. I am using a three bolt gear drive. I am going to get the shop to convert the slant cam to the three bolt design and make a spacer to engage the camshaft and the camshaft gear properly. The metal itself might be two dollars. LOL
 
RustyRatRod said:
Well, it would be simple enough make the dual idler a fixed idler since the front of the slant six block is flat. Just one more consideration I suppose. I see no problem with the dual idler, either. I've set a few up before and the timing is much more stable than a chain. When set up right, there's zero slack.
Click to expand...


Read my post and do a fixed idler. You'll be much happier in the end.
 
You must log in or register to reply here.
-

Back
Top