Engine and Transmission Tech

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

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BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5854 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: New guy
Posted by: BlownMGB-V8
Date: November 02, 2019 11:38AM

Conical valve springs are a little different. Not much, but the beehives pull in more at the top where the conicals have a constant slope. Modern beehives also use an elliptical wire cross section.

The objective is to both increase range to allow more lift, and to decrease the spring pressure requirement by reducing the reciprocating mass at the top of the spring and the retainer. I think the reduction in harmonics was an unexpected side benefit. That happens because of the increasing spring rate as the diameter decreases. Because the harmonic is a wave that moves up and down the spring, the increased rate damps it out. Probably the beehive is a little more resistant to harmonics than the conical design. It is claimed that a beehive spring and keeper reduces reciprocating weight (or perhaps it is the required spring pressure) more than titanium valves but I'm not sure if I buy that. However it seems pretty certain that one, the other, or both can significantly reduce the amount of spring needed for a given lift and RPM, thereby increasing cam lobe life and potentially increasing HP output.

Jim


Young olds
roger parkey
Washington state
(55 posts)

Registered:
05/02/2018 07:07PM

Main British Car:
Opel 1900 sport coupe 1975 Oldsmobile 215

Re: New guy
Posted by: Young olds
Date: November 04, 2019 03:10PM

Anyone run a crowed 50234 cam? Wondering if I can run it with stock pushrods and rockers?


MGBV8
Carl Floyd
Kingsport, TN
(3812 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB, Buick 215

authors avatar
Re: New guy
Posted by: MGBV8
Date: November 05, 2019 10:29AM

Possibly. You will certainly need deeper valve spring pockets & the guides cut down for clearance.


mgb260
Jim Nichols
Sequim,WA
(2019 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: New guy
Posted by: mgb260
Date: November 07, 2019 11:36AM

Cam is too big for a 215. It is one size up from what we used in Chris's 300 stroker( 350 ). I used the 50232 years ago in a 215 and it worked well but didn't seem to wake up until over 2000RPM. I think the 50230 would be perfect for the 215 on the street. There is also a 50231 in-between.


MGBV8
Carl Floyd
Kingsport, TN
(3812 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB, Buick 215

authors avatar
Re: New guy
Posted by: MGBV8
Date: November 08, 2019 11:38AM

I agree with, Jim. I think even the 50232 is too big for a street 215. I have one, but it is to go into a 3.9 or slightly larger version of a Rover V8.


Young olds
roger parkey
Washington state
(55 posts)

Registered:
05/02/2018 07:07PM

Main British Car:
Opel 1900 sport coupe 1975 Oldsmobile 215

Re: New guy
Posted by: Young olds
Date: November 08, 2019 02:58PM

The cam I have now is bigger then the 230, close to the 232, I do not think it is even remotely to big for the street. I have a couple of bad lifters and figured I might go for a larger cam.


MGBV8
Carl Floyd
Kingsport, TN
(3812 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB, Buick 215

authors avatar
Re: New guy
Posted by: MGBV8
Date: November 09, 2019 10:12AM

All depends on what you expect from the engine. I have a .560 solid lift cam in my old Camaro. It gets to be a chore to drive after a while.



BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5854 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: New guy
Posted by: BlownMGB-V8
Date: November 10, 2019 12:41AM

I had the CC 268H in my first 215 and liked it a lot. Not sure how that compares to the Crower though.

Jim


Young olds
roger parkey
Washington state
(55 posts)

Registered:
05/02/2018 07:07PM

Main British Car:
Opel 1900 sport coupe 1975 Oldsmobile 215

Re: New guy
Posted by: Young olds
Date: November 10, 2019 04:46AM

Do you remember the specs?


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5854 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: New guy
Posted by: BlownMGB-V8
Date: November 10, 2019 03:48PM

No, they discontinued that grind for the BOPR but it was still available for other engines. It was a bit warm though.

Jim


Dan Jones
Dan Jones
St. Louis, Missouri
(269 posts)

Registered:
07/21/2008 03:32PM

Main British Car:
1980 Triumph TR8 3.5L Rover V8

Re: New guy
Posted by: Dan Jones
Date: November 14, 2019 12:36PM

Comp 268H would have been:

218/218 degrees duration @ 0.050"
268/268 degrees advertised duration
0.285"/0.285" lobe lift
0.456"/0.456" valve lift with 1.6:1 rocker ratio
110 degrees LSA

Dan Jones


Young olds
roger parkey
Washington state
(55 posts)

Registered:
05/02/2018 07:07PM

Main British Car:
Opel 1900 sport coupe 1975 Oldsmobile 215

Re: New guy
Posted by: Young olds
Date: November 24, 2019 09:11PM

My current cam is( which I decided to stay with)
Single pattern
214 @ 0.050
292 adv.
.478 lift
On a 112 and 5 advance ground in.


MGBV8
Carl Floyd
Kingsport, TN
(3812 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB, Buick 215

authors avatar
Re: New guy
Posted by: MGBV8
Date: November 29, 2019 03:45PM

I would think that a dual pattern cam would be helpful for the Buick/ Rover V8 heads.
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