Engine and Transmission Tech

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

Go to Thread: PreviousNext
Go to: Forum ListMessage ListNew TopicLog In
Goto Page: Previous1234Next
Current Page: 3 of 4


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5966 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
(74 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
(3991 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
(2061 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
(3991 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
(74 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
(3991 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
(5966 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
(74 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
(5966 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
(74 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
(3991 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.


Young olds
roger parkey
Washington state
(74 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: February 06, 2020 02:43PM

Work on the opel has been pretty slow, new engine is together and nearly done but waiting for the car to be ready to accept it.
E9663B9B-7A3D-43BA-9700-CBFB5D6B1D5D.jpeg
907918D5-00C8-4C93-B4BA-7D8C60F55457.jpeg
690DCC57-BC0A-411E-852B-32BFF8587386.jpeg
A9835B56-1F48-443D-8353-8ACA5F2AD8F9.jpeg


Young olds
roger parkey
Washington state
(74 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: February 06, 2020 02:44PM

I do not have any pictures of the engine but I will get some.
867E1960-5737-4F83-BA81-3180F8F9C7B1.jpeg
I cut the inner fenders out, made down bars for the upper shock mount as well as to stiffen the front end. I decided to ditch the electric pusher fan in favor of a mechanical fan which meant moving the radiator forward for clearance. I have been loosely copying these, more so the factory opel car then the TE, [www.yumpu.com]



Edited 1 time(s). Last edit at 02/06/2020 02:50PM by Young olds.



Young olds
roger parkey
Washington state
(74 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: October 24, 2020 10:52AM

Been a while, figured I would update now that the car is running.
792CE962-07A1-415B-AD46-E7C9AB446214.jpeg
A39D4E40-ABB1-4AA1-ACD7-3B91F5EB1B0A.jpeg
08E056AC-CA86-430A-8A77-E3DAB207A053.jpeg
C1AB9B4D-F183-46DC-9E31-82AF86560557.jpeg


Young olds
roger parkey
Washington state
(74 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: October 24, 2020 11:06AM

I had my buddy build me a coolant surge tank that adds 1 gallon to the coolant capacity, I had my stock radiator rebuilt into a 3 core and I am going to a mechanical clutch fan in place of the electric pusher I had before. I have replaced all suspension bushings with new poly, rear diff and pinion extension have been strengthened. I built 15x10/15x8 Oz Vegas wheels. Added a harness bar so I could instal my 5 point harness without a roll bar, probably a few things I am forgetting.
8814BEC7-146A-4169-B19D-60870E440851.jpeg
48350B71-FB58-4974-83B4-A8A76F799507.jpeg
9E02911E-A4CB-40B8-8007-E7014C18340D.jpeg



Edited 4 time(s). Last edit at 10/24/2020 11:15AM by Young olds.


40indianss
don foote

(71 posts)

Registered:
08/01/2013 04:35PM

Main British Car:


Re: New guy
Posted by: 40indianss
Date: October 24, 2020 12:29PM

I am liking it. It's different Should be pretty cool when finished


Young olds
roger parkey
Washington state
(74 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: October 24, 2020 02:50PM

I forgot a few things, I removed the s30 flares in favor of the stienmentz box flares and have been working on these drla carbs to run on my harcourt downdraft intake.
E1100222-84A3-4895-91E5-C450B61FDF77.jpeg
8A081233-1542-440A-B69A-C622C0EB88BB.jpeg
58460A60-9D75-4EEE-AF6D-DA32A3EF3D47.jpeg



Edited 1 time(s). Last edit at 10/24/2020 03:05PM by Young olds.


roverman
Art Gertz
Winchester, CA.
(3061 posts)

Registered:
04/24/2009 11:02AM

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

Re: New guy
Posted by: roverman
Date: October 27, 2020 06:59PM

About those Hilborns, I suspect butterfies are 1.8" diameter ? Mickey ran 215 Buicks at Indy/etc. Possible Hilborn didn't have a timing cover/drive, at the time. That would never stop Mickey.
Welcome, Art.
Goto Page: Previous1234Next
Current Page: 3 of 4


Sorry, only registered users may post in this forum.