Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Serious Cams
Posted by: roverman
Date: September 01, 2010 06:57PM

Fred, previous post, we covered using Buick V6,(3100 and 3800) hyd. rollers. They drop-in without bleed-off issues. Dog bones also work. Questionmark at this juncture, is best way to retain ? Some propose,overlapping spyders, bolted to block valley area. Thanks, roverman.


mgb260
Jim Nichols
Sequim,WA
(2241 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Serious Cams
Posted by: mgb260
Date: September 02, 2010 12:33AM

I think Art means 3100 and 3400 ,not 3800. The 3800 uses longer lifters like Chevy and Caddy. Late 3.8 (86-88) roller Buick V6 spiders overlapped.Or Paul's upside down Ford 5.0 spyder.Or try the Caddy 4.9 spyder,shorter than Chevy,might be just right.Here is a picture of Caddy 4.9 spyder.
4_9_rebuild_037_1.jpg


roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Serious Cams/Caddy with a spyder
Posted by: roverman
Date: September 02, 2010 10:44AM

Thanks Jim, Perhaps you could a. measure or b. loan/sell one to Paul ? I'm thinkin a "spyder" in the kitchen...not too weird? This is how we roll. roverman.


DiDueColpi
Fred Key
West coast - Canada
(1333 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

authors avatar
Re: Serious Cams
Posted by: DiDueColpi
Date: September 02, 2010 03:34PM

Hey Art, totally aware of the lifter issues. Just "threw the dog a bone" to offer some options. The Buick dog bones are hard to find up here. But the Ford ones seem to grow on trees.
Roll on
Fred


roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Serious Cams
Posted by: roverman
Date: September 02, 2010 07:47PM

Fred, Isn't the Ford about .875" dia. ? I bought "lots" of lifters/dogbones on ebay(Detroit take-outs from GM. assembly line). Never run. Chevrolet 60 deg. V6. .842" dia./good-to-go. I'm starting to convert these to mech.(internals), less weight/more zip. roverman.


DiDueColpi
Fred Key
West coast - Canada
(1333 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

authors avatar
Re: Serious Cams
Posted by: DiDueColpi
Date: September 03, 2010 03:33AM

Yep the Ford body is 0.875" but the upper portion necks down to what appears to be an industry standard size. The only difference looks to be in the lifter bore spacing. I ordered up a full complement of bones from comp. and they all fit the lifters, they just don't all fit the block.
By the way, how tight do you intend to spin your engine? A hydraulic lifter should be able to out rev your crank and head with ease. Any weight advantage would be lost with the addition of an adjuster on the rocker.
However if we made them out of plaidmium like Mikes door panels............
Cheers
Fred


mgb260
Jim Nichols
Sequim,WA
(2241 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Serious Cams
Posted by: mgb260
Date: September 04, 2010 01:46AM

Paul, 4.9 Caddy spider dimensions: 14 1/4" length longest point to opposite longest point, 5 1/4" wide finger end to finger end, lengthwise spacing between finger centers 4 1/2". 11" bolt hole center to bolt hole center. Look at picture in message above. How does that compare to the 5.0 Ford?



Edited 1 time(s). Last edit at 09/04/2010 01:58AM by mgb260.



roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Serious Cams/pladmimum ?
Posted by: roverman
Date: September 04, 2010 11:53AM

Fred and clan,how did this thread get so twisted ? FYI, hyd. lifters tend to "bleed-off" hp. above 5k rpm.The "converted" lifter is 11 grams lighter. Reference, Engine Masters Mag., bbm lost 30hp. by 6,200 rpm.? My 4.0L , with skinny cast crank would road race, up to 8k and LIVE.To build a Rover that only runs to 5k, is under-mining the purpose of a small light weight V8 ? roverman.


pcmenten
Paul Menten

(242 posts)

Registered:
10/08/2009 10:40AM

Main British Car:


Re: Serious Cams
Posted by: pcmenten
Date: September 15, 2010 03:32PM

Jim, thanks for the specs. I'll dig into that this weekend.

Art, in re: engine tuning, my 86 Mustang with roller cam has massive low-end torque, probably much more than a flat-tappet cam. Flat tappet cams can be designed to spin 8k and make power like a roller, but the flat tappet cams just don't make the low-end torque.

The other problem with tuning for 8k is the exponential increase in cost as engine speed goes up; titanium retainers, lightweight rockers, titanium pushrods, beefy con rods, etc.

I'm thinking a roller 4.0 will have low end torque like a 4.6, and a roller 4.6 would pull like a locomotive.

Paul


roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Serious Cams/ train of thought ?
Posted by: roverman
Date: September 15, 2010 04:21PM

More than 5, less than 8k ? Non of this matters with-out a bump-stick. Anyone find a grinder with matching masters ? roverman.


roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Serious Cams vs, Real Steel's "Tornado"
Posted by: roverman
Date: September 16, 2010 09:31PM

Clan, anybody got one to spec-out like Fred did , on the Ford roller ? It's time to knock their cam, off the perch ! I'll check for a suitable cam "master", with Contreras Cams. "Rollin on a Rover"....roverman.
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