Engine and Transmission Tech

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

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Blown v8
Bryan Phipps

(72 posts)

Registered:
03/10/2013 04:52PM

Main British Car:
Re: Bla Bla Bla roller cams
Posted by: Blown v8
Date: February 24, 2020 11:29AM

As soon as I find out, I will post on here


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

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

Re: Bla Bla Bla roller cams
Posted by: roverman
Date: February 28, 2020 10:54AM

Get the cam , problem lobe(s), Rockwell "c" hardness tested ! Stop guessing. Should be 56-58c +/-. No need to bed-in a roller cam.


Blown v8
Bryan Phipps

(72 posts)

Registered:
03/10/2013 04:52PM

Main British Car:
Re: Bla Bla Bla roller cams
Posted by: Blown v8
Date: March 04, 2020 12:19PM

Full lift, the springs are 465lb. !
The cam is back, like new and freshly hardened.
More bad news ,on inspection one of the top hat liners had “slipped” down, . It couldn’t have been done properly in the first place.
This was a brand new block, I had top hatted. Liner being done,and new cam bearings,
We’re going to source springs around 300lb
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turbodave
dave cox

(181 posts)

Registered:
04/30/2018 03:00PM

Main British Car:
SD1

Re: Bla Bla Bla roller cams
Posted by: turbodave
Date: March 04, 2020 08:58PM

Can I ask who did the top-hat as I'm looking to get this done - and would like to know who I should maybe scratch from the list... Email if you'd prefer....


Blown v8
Bryan Phipps

(72 posts)

Registered:
03/10/2013 04:52PM

Main British Car:
Re: Bla Bla Bla roller cams
Posted by: Blown v8
Date: March 05, 2020 02:19AM

I’m in the UK,
It was a firm called DJE, now long gone


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6469 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Bla Bla Bla roller cams
Posted by: BlownMGB-V8
Date: March 05, 2020 10:38AM

Well those were some rather impressive springs. Bet it never complained about the redline though. I'd guess good for 8 grand or better? Though you'd run out of wind before that without a blower.

Jim


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

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

Re: Bla Bla Bla roller cams
Posted by: roverman
Date: May 07, 2020 12:28PM

Good chance of breaking something in the valvetrain, with all that pressure. This is why some, not enough, buy cam and kit. A call to your cam maker, tech., luck of draw who you get for advice. Art.



Blown v8
Bryan Phipps

(72 posts)

Registered:
03/10/2013 04:52PM

Main British Car:
Re: Bla Bla Bla roller cams
Posted by: Blown v8
Date: May 08, 2020 12:12PM

It was bought as a kit, all back together now, new cam bearings were fitted,
Won’t be long before it’s on the dyno
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