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Blown v8
Bryan Phipps

(47 posts)

Registered:
03/10/2013 04:52PM

Main British Car:


,New Blower and TA heads included
Posted by: Blown v8
Date: March 11, 2013 05:24PM

Would this

8514* BLOWER - 215 OLDS 471 MANIFOLD, UNPOLISHED, 2 PIECE $1,511.35
Fit a 4.6 rover block with Buick 300 heads, ? Or will I still need spacers ?



Edited 2 time(s). Last edit at 08/28/2014 12:07PM by Blown v8.


roverman
Art Gertz
Winchester, CA.
(2974 posts)

Registered:
04/24/2009 11:02AM

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

Re: Inlet manifold question
Posted by: roverman
Date: March 11, 2013 06:25PM

Bryan, how about a picture ? What is an 8514 blower ? I woudn't spend a dime, till I knew the port dimensions of the blower manifold. 300 head ports are approx 30% larger than 215. I modded an Offy single-plane maniflold, with a "Dyer Blowers" top half, to fit a 6V-71. This mated, with welding, to the Offy manifold perfectly. Rover and 215 deck heights, are the same. Good Luck, roverman.


Moderator
Curtis Jacobson
Portland Oregon
(4411 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: Inlet manifold question
Posted by: Moderator
Date: March 11, 2013 09:44PM

Art, I did a quick Google search and came up with this link...
[blowerdriveservice.com]

Bryan, I've never heard of the company "Blower Drive Service" before. I suggest phoning them. I'd certainly be interested to hear whatever you find out!


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5762 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Inlet manifold question
Posted by: BlownMGB-V8
Date: March 12, 2013 12:00AM

BDS has been around quite awhile.

Jim


Blown v8
Bryan Phipps

(47 posts)

Registered:
03/10/2013 04:52PM

Main British Car:


Re: Inlet manifold question
Posted by: Blown v8
Date: March 12, 2013 07:22AM

A little history,I've had supercharged Rovers for twenty years,3.5s 4.6 and for the last five years, a 4.6 with a one off billet steel crank,giving me 5.0L,
Steel rods,top hat liners,forged pistons,I've used what we call SDi heads,(3.5 ) ported,slightly larger valves,O ringed ,the bowls made larger to suit the larger
bore,roller rockers,the cam is a one off made to my own spec ! 114 lobe centres,4:71 GMC blower mated to a Elderbrock performer manifold.Holley 650cfm double pumper blower carb
On a dyno,it made 419bhp and 412 lbs of torque ay 5800rpm
I've now got hold of a set of 300 Buick heads,now before you all scream, get TAs, I'm going the tried and tested way of the bigger valves,and a good porting job
with these heads fitted,do I need a manifold designed for the 300 ? Or will I be able to modify my existing ?
I respect your answers,as there seems to be a wealth of knowledge on here second to none
Bryan
Nearly forgot,blower is running 10% over,



Edited 1 time(s). Last edit at 03/12/2013 07:35AM by Blown v8.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5762 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Inlet manifold question
Posted by: BlownMGB-V8
Date: March 12, 2013 10:42AM

Bryan, I'd say if you were pushing enough boost through a set of SD1 heads to get that sort of power then you will not be disappointed with the 300 heads. You can always consider the TA heads as a potential future upgrade. What vehicle do you run this engine in, and could you post a "How it was done" article?
[www.britishv8.org]

I've run blown and boosted for 20 years now myself, starting with a modified Olds Jetfire and there are other blower freaks on here also so you are in good company and it's always good to see a new perspective. Where are you located?

Now as to matching the 300 heads to the 215 blower intake on the 4.6 block, that should not be much of a problem. Everything should match up just fine, the only issue is that the 300 heads have a little bigger intake ports. And I've forgotten how much bigger they are but there should be plenty of material in the BDS blower intake to port match. Of course, the step is going in the right direction (bigger ports in the heads) so even if you just slapped it on it'd work plenty fine, you'd just get a slight bit of turbulence below the step.

Since you've had your engine on the dyno is there any chance you have a dyno plot you could post? I'd love to see the torque curve with that setup. I'm guessing you are running about 8:1? What sort of mileage do you get?

I ran an Eaton M-90 on an Olds 215 for a lot of years, pushing 16 psi through those tiny ports but it gave me an entirely different view of things. Hopefully my M-112 equipped 340 will be back on the street this spring. It will undoubtedly satisfy my horsepower needs for quite some time. Details of that build are in the 340 thread. This page shows intake fabrication details:
[forum.britishv8.org]

Jim


roverman
Art Gertz
Winchester, CA.
(2974 posts)

Registered:
04/24/2009 11:02AM

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

Re: Inlet manifold question
Posted by: roverman
Date: March 12, 2013 11:25AM

Bryan, What is your intended manifold pressure ? I suspect with your latest build, a 4-71 will prove a little small. If you must run a GMC/Rootes type, a 6V-71 will make more boost, easier. What is your current boosted air temp at desired boost ? An M112 , like Jim is using or most centrifugals, will have much better efficiency. The Offy single plane, mentioned earlier, is quite easily ported to 300 size. Cheers, roverman.



Blown v8
Bryan Phipps

(47 posts)

Registered:
03/10/2013 04:52PM

Main British Car:


Re: Inlet manifold question
Posted by: Blown v8
Date: March 12, 2013 12:29PM

Thank you for the quick replies , my scanner isn't working,so I photographed them !
image.jpg
image.jpg
Note,I was only running 5.5psi, spent a lot of time port matching
My car
image.jpg
In the UK we call them Populars,you call them Anglia's mine's 1954,had it 26 years
As it is know
image.jpg
New tube chassis being built


MGBV8
Carl Floyd
Kingsport, TN
(3639 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Inlet manifold question
Posted by: MGBV8
Date: March 12, 2013 02:35PM

Yep. Blower Drive Service has been well known in the hot rodding circles for a long time.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5762 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Inlet manifold question
Posted by: BlownMGB-V8
Date: March 12, 2013 04:17PM

Pretty impressive numbers, and a fine looking ride.
At some point I hope to get a dyno run and have them map the lower numbers. I really want to know what it looks like under 3 grand as that's where I do most of my driving, and so my builds have been shifted towards the lower and midrange. I'd guess your heads will shift things upwards a bit.

Jim


joe_padavano
Joseph Padavano
Northern Virginia
(121 posts)

Registered:
02/15/2010 03:49PM

Main British Car:
1962 F-85 Deluxe wagon 215 Olds

Re: Inlet manifold question
Posted by: joe_padavano
Date: March 14, 2013 03:26PM

When I lived in SoCal decades ago, a friend of mine did all the polishing for BDS.

BDS routinely fabricates blower manifolds when none is easily available. Their preferred method is to start with an Offy single plane dual quad intake, mill the carb flanges flat, and bolt/weld a thick aluminum blower mounting plate to it. Since there aren't any readily available dual quad intakes for the BOPR, I don't know if they start with a single 4bbl intake or an EFI intake.

Any BOPR intake will bolt up if 300 heads are used on a BOPR, but the intake manifold ports will be smaller, so some port matching is required.


roverman
Art Gertz
Winchester, CA.
(2974 posts)

Registered:
04/24/2009 11:02AM

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

Re: Inlet manifold question
Posted by: roverman
Date: March 14, 2013 04:29PM

Using an oem./dual plane manifold, with a rootes blower on top, is a bad idea ! Distribution is all wrong, and full length of runners, are too small.If not using a BDS,= expen$ive, the Offy, NON dual port, single plane 4 bbl, is well suited, as previously outlined. Onward, roverman.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5762 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Inlet manifold question
Posted by: BlownMGB-V8
Date: March 14, 2013 04:43PM

The Offy dual-port (360*) works well for a blower intake once the dividers are removed. I built one that way for my Olds 215. Large plenum area, but you also have to remove the port dividers.

Jim


roverman
Art Gertz
Winchester, CA.
(2974 posts)

Registered:
04/24/2009 11:02AM

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

Re: Inlet manifold question
Posted by: roverman
Date: March 14, 2013 06:42PM

Yes, for 50cents/hr, one could do that, or just buy an Offy single port, for $2++ new ? The best part of the Offy single plane, for blower use, is it's nearly "all" plenum ! News flash, they have the 2x2bbl/large base, manifolds in stock. They are non heated around the carb. bases, making IDF Webbers, an easier option. This makes it well suited for a "Dyer" top piece, and a 6V-71. No Affilliation ! roverman.



Edited 3 time(s). Last edit at 03/14/2013 09:54PM by roverman.


Blown v8
Bryan Phipps

(47 posts)

Registered:
03/10/2013 04:52PM

Main British Car:


Re: Inlet manifold question
Posted by: Blown v8
Date: March 15, 2013 06:29AM

Has anybody got a link for these manifolds ?



roverman
Art Gertz
Winchester, CA.
(2974 posts)

Registered:
04/24/2009 11:02AM

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

Re: Inlet manifold question
Posted by: roverman
Date: March 15, 2013 11:12AM

" Dyers Blowers" and Offenhauser Racing, both have webbsites. Cheers, roverman.


Blown v8
Bryan Phipps

(47 posts)

Registered:
03/10/2013 04:52PM

Main British Car:


Re: Inlet manifold question
Posted by: Blown v8
Date: March 15, 2013 04:04PM

Thanks for the help,
I've found this
image.jpg
Could someone confirm its the right one ! Going to go bigger blower now


roverman
Art Gertz
Winchester, CA.
(2974 posts)

Registered:
04/24/2009 11:02AM

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

Re: Inlet manifold question
Posted by: roverman
Date: March 15, 2013 04:20PM

Bryan, The single port 4 bbl, is reportedly available in approx. 3 weeks, from Offy. I cut-down the central plenum divider to a max. height of appox. 3/8', with a 90 deg., inverted "^" on top, to better split the charge air/fuel. I think youll like the added boost potential, with less heating, from a 6V-71. According to Dyer site, this blower should produce 15 lbs boost @ 1/1 drive, on a 300" motor. Make sure you get the "large rotor one" ! Good Luck, roverman.



Edited 1 time(s). Last edit at 03/15/2013 04:46PM by roverman.


roverman
Art Gertz
Winchester, CA.
(2974 posts)

Registered:
04/24/2009 11:02AM

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

Re: Inlet manifold question, overlap ?
Posted by: roverman
Date: March 15, 2013 04:57PM

Bryan, 5.5lbs of boost at 10% overdrive, even on a 4-71,sounds "light" on boost. Could you post your cam spec's. ? Possibly too much overlap, is hurting your boost potential ? Cheers, roverman.


Blown v8
Bryan Phipps

(47 posts)

Registered:
03/10/2013 04:52PM

Main British Car:


Re: Inlet manifold question
Posted by: Blown v8
Date: March 17, 2013 01:51PM

The cam was ground at 114 degree lobe centres,
Duration @ 0.50 intake 234*
Duration @ 0.50 exhaust 244*
Lift @valve intake .488
Lift@ valve exhaust .510*
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