1981 Mercury Capri BDA Cosworth?

[Ray Dog]

This motor looked familiar, because I see it was the power for the 83/84 Mustang GTP

www.supercars.net/blog/1983-ford-mustang-gtp/

It sounded like it got beatup real bad in that car.

[cb650]

There is a old IMSA race on utube where one of the cars won at mazda raceway. Cant remember the name of what it was then. Laguna seca?






Did find this looking for that race.
https://www.youtube.com/watch?v=KdXJSrpkSsw



Found it.
https://www.youtube.com/watch?v=Q7PtiJICaVE

[xctasy]

Great stuff, cb650!


You can see in some of these pictures below how little metal there is in a 1975 to 1998 cc BDG style engine.

About 0.237 inches (237 thou) from the side of each cylinder. And I thought 275 thou from a 4.125" bore 400 Chev was "pushin it"


BDG's were "officially" only ever Cosworth Engineering's name for the large DFV/DFX bearing carrier headed, Lucas injected, iron blocked engine. Only about two engines officially.

Cosworth were very careful to protect there empire, and Ford was very careful to make sure it won races. The rules allowed Works engine blocks to be replaced by aluminum versions, which happened very early on in the just before Fords Total Performance era pull out in official racing for 1973.


The iron block was selectively supplied from technically Siamese bored 3.78 inch spacing iron blocks, then specially welded via another company for Cosworth.

You can pick up those so called BDG blocks, as liner shift was common, and failure did occur. More than two exist!

You can get them, then have them reworked with modern sleeves.




They were built as other letter Cosworth BD's and it depended as to what crank and rods went into them as to the final type of engine, so you can get a numbers match BDG block from a BDF if you know where to look.









The generic "BDG" tag was therefore descriptive only, and was transferred/bandied about over to the aluminum block engines, which were Ford supplied via Brian Hart from late 1972.




The American situation in GTP for 81 required a 100% iron block, so even an aluminum block like this 13 grand item isn't legit






http://www.race-cars.com/engsold/cos...42486066ss.htm

The ground effects 1982 and probably 1983 GTP Mustang was officially spoken of as being iron blocked, as per the 1981 GTP. This includes the commentators information for the 1983 race car.

The engine was a really a great stock block engine, but technically a failure in regards to endurance durability in 1975 cc or 2.1 liter form, as it missed cylinder to cylinder cooling, and was pushing the stock 711 block too far, very much like a 400 Chev pushed the 4.4" bore engine a little too far, but, you know, all great F5000 race cars used bored out 400 Chev blocks with short stroke to get great power! My information is that when turboed, the BDG became cast aluminum blocked.

The last GTP Mustang front engined cars was homologated to use a 2.1 liter de-stroked Indy Car Cosworth DFX V8. Basically, you had twice as much space between each cylinder bore with it.



The 1600 Mercury Capri Cosworth was indeed a pidegoen pair to the M81 McLaren race car, but it was a very smart use of an iron block engine for a specific job....to make Ford USA victorious with a European style 16 valve Mark 1 Escort engine!

The 1981 Capri Cosworth and Mustang M81 twin cam era was far away from Jack Roushe's ideas on endurance racing. Mike Kranefuss did very well based on the difficutly of making a front engined car with no front weight work at all on the track.

Jack could see that a Siamese bore engines weren't gonna work easily unless it was a cast iron SVO blocked 335 or Windsor Cleveland Plant engine.

[KCoker]

Riley McCoy built the motors for the M81 McLaren's.

[brianj]

Hmmm. And I thought I was all clever building a steel body kit. They beat me to it by a large number of years.

[xctasy]

Riley McCoy built the motors for the M81 McLaren's.

I didn't know that, Kendal. Was he related to John McCoy, the Omnitech guy who did the 711M reworked block oiling system?

https://omnitech-engineering.com/ima...n10_p10-11.pdf


Roush was involved in most of the early SVO related GTP stuff, but kept away from the BD-Ahhhye....

I think with 3.564" pistons in the 20 thou over size, that's just 216 thou between each cylinder of a 1998 cc version, I can see why Roush bailed..... Probably to do the same with 4.185 bore SVO blocks on 4-3/8" bore centers. 190 thou between walls. Turncoat!

BMW had exactly the same issues with the same bore spacing engines it used. The smaller in line six cylinder 323i's and all those Siamese-dream engines like the early 4cyl M3 were all pushing the bore spacings within a thousandths of an engine life. Everyone says the don't like siamese bore engines, until they win races! Endurance racing, well, I guess its like yacht racing, or space ships, the moment you blowup, sink or aluminum shower one, you know you've gone too far in weight reduction.

Cosworth was very much against the big bore engines, and kept out of the 3.3 and 3.9 Endurance DFL and 3.5 DFZ/DFR engines Ford had planned for LeMans. Duckworth was very clear on this, but they still kept making them, heah!

brianj, your ahead of us all.

[KCoker]

I didn't know that, Kendal. Was he related to John McCoy, the Omnitech guy who did the 711M reworked block oiling system?

https://omnitech-engineering.com/ima...n10_p10-11.pdf


Roush was involved in most of the early SVO related GTP stuff, but kept away from the BD-Ahhhye....

I think with 3.564" pistons in the 20 thou over size, that's just 216 thou between each cylinder of a 1998 cc version, I can see why Roush bailed..... Probably to do the same with 4.185 bore SVO blocks on 4-3/8" bore centers. 190 thou between walls. Turncoat!

BMW had exactly the same issues with the same bore spacing engines it used. The smaller in line six cylinder 323i's and all those Siamese-dream engines like the early 4cyl M3 were all pushing the bore spacings within a thousandths of an engine life. Everyone says the don't like siamese bore engines, until they win races! Endurance racing, well, I guess its like yacht racing, or space ships, the moment you blowup, sink or aluminum shower one, you know you've gone too far in weight reduction.

Cosworth was very much against the big bore engines, and kept out of the 3.3 and 3.9 Endurance DFL and 3.5 DFZ/DFR engines Ford had planned for LeMans. Duckworth was very clear on this, but they still kept making them, heah!

brianj, your ahead of us all.

I think it was Gary Knutson was the one that told me he built the motors and gave me his number. I talked to him about another motor for mine but he didn't have one. He did confirm that he built the motors. Don't know about John.

[xctasy]

Pm'd you back, and emptied my in box..

Just some References on how loved the 10000 rpm carbed 240 to Lucas Injected 300 hp 2 liter aluminum block engine is in New Zealand.


See https://classicdriver.co.nz/works-es...s1800-group-4/

I guess car collections is cheating, but.....

My son is a Ventilation Technician. That means he gets to scrape out Restaurant HVAC systems. Yeah boy!

The fruits of it is that nice ladies and Cafe owners ask him to come over and see the neighboring sites, like the Steam Punk crazy locals penchant for Speed, Steel, Iron, Brass, and Rallye cars.

So Tuesday morning, while in the StreamPunk building next door to the car museum in the Oamaru Victorian Precinct,

Ash my son got to glide into the Oamaru Auto Collection, and salivate over

the Mark III GT40 Replica was in front of the Escort

the E49 Chrysler Valiant Charger

http://i1215.photobucket.com/albums/...607_145032.jpg

The front drive fiberglass Mini front drive coupe.

http://i1215.photobucket.com/albums/...607_145009.jpg

Mini Cooper S

http://i1215.photobucket.com/albums/...607_144933.jpg

the Ford Escort RS 1800 (ex Masport Escort, ex Ari Vatenen Rothmans





Audi Quattro (ex Malcolm Stewart )

http://i1215.photobucket.com/albums/...607_144900.jpg

No 6 1953 Ransley Riley, with supercharged 4 cylinder 2.5 liter engine

and

the 135/60 engined No 414 Stuart Ford Flattie V8 Special

http://i1215.photobucket.com/albums/...607_144911.jpg

Rally RS 240SX Silvia

http://i1215.photobucket.com/albums/...607_144927.jpg

Skoda Rallye S110 L 1973... Kommie Kar the Kiwis raced

http://i1215.photobucket.com/albums/...607_145004.jpg

We race alloy block BDG's all the time, some iron BDF's are still around, but the iron 711m non Cosworth block is often used.

https://www.odt.co.nz/sport/motorspo...tago-southland
https://www.stuff.co.nz/southland-ti...p-in-southland

and the Silver Fern Rally


https://nzmotorracing.co.nz/2018/11/...ly-time-again/

The Ford Escort is by far the most popular single model entered with 19 of the 31 pairings using either MK 1 or Mk 11 models.

My fav is the Zakspeed Mark I




and the last Zakspeed Mark II Escort Group 5.



http://www.themotorhood.com/themotor...t-in-the-world

Mike Kranefuss knew exactly where he was heading with these cars...

[KCoker]

ectasy your PM box is full. Here is a pic of the M81 motor.

[xctasy]

Thanks, and its Nice...the rebuild of No2 differs just a little to the spare 01 in alternator brackets, breather line, braiding for op hose, the lines to the DCO 50's....under carb throttle cable, etc.

In think I know see where the two Cosworth McLaren M81's and Mercury Cosworth Capris fit...its right HERE!!!!





So I'm guessing the race versions were all alloy, and were the same as the BDG Mercury Lynx Rear drive conversion, a sort of RS1700 without the T...

http://www.speedhunters.com/2018/12/...-mercury-lynx/








Every part except the alternator mounting is the same. Throttle linkages and other Weber DCO details

A fantastically restored Ford-Cosworth BDG 2.0-liter four-cylinder engine, initially developed for the Firestone Motorsport McLaren M81 Mustang.

https://bringatrailer.com/listing/1983-mercury-lynx/

The Ford/Cosworth BDG 2.0-liter inline-four was developed initially for the Firestone Motorsport’s McLaren M81 Mustang. Before being installed in the Lynx rally car in 1983, it was sent to Terry Hoyle, where it was refreshed and adapted for rally use. It utilizes a Gartrac dry-sump oiling system, with induction from a pair of 50mm DCO side draft Webers. The original header and exhaust system specified by Terry Hoyle remain installed, and the engine is configured to run on 110-octane race fuel. Maintenance performed during the 2018 refresh included the following:
New Cometic/Blue Sky Racing head gasket
New Blue Sky Racing racing water pump with billet impeller
New Blue Sky Racing valve seals
New Blue Sky Racing cam cover gasket purchased and installed
Removed, cleaned, and inspected valvetrain and cylinder head
New NGK R015 8 spark plugs installed (per original Terry Hoyle spec)
New Red Line synthetic oil added
Removed, cleaned, and rebuilt starter

I'm quessin' where it came from? M81.., not the Cosworth Capri

[vintageracer]

That sure looks like a "Toyota" motor to me!

[xctasy]

That sure looks like a "Toyota" motor to me!

LOL. Toyota was a lot like Triumph. With the money they saved on not making the body engineering sound, they paid for a lot of extravagance in engines and rear suspensions. At least with Toyota, it paid off, not so Triumph!

The only thing, imho, is to compare the incompetence of Toyta's (and Nissans) stolen twin cam and later 4 v per cylinder technology with the smarts and depths of the Midlands English energy and hard work, and the beauty of the old Offy, Stutz DV32 and Desenberg J and SJ's.

My wife and family has only had Toyotasand Nissans...the 4AGE and 3S engines the Japs copied from Nissan, Nissan copied from Cosworth, Cosworth copied from Offenhauser, Offenhauser copied from Stutz and Duesnburg, and that they copied from the French....

I've opened up every one of Toyotas modern twin cam multivalves. And they are a disaster of being unable to service easily.

Nothin' new since Walter Hayes in England paid Costin & Duckworth the privilege of having Ford's name on nearly every 4 valve per cam cover.

Right above, on all these previous posts, is proof that the Ford Motor Company re-invented the modern pentroof, four valve per cylinder head by buying in the technology from a subcontractor. And won races.

Just like Ford re-invented the North Italian thin wall castings OS did back in 1919, with the ultra thin wall castings for the 1962 Thin Wall Small block 221-260's,

and like how they decided to mass produce the one piece casting of the 1932 V8 engine block,

and make the proper, simple and reliable modern EFI engine management systems from 1980-1986.

Ford has a great habit of engaging with suppliers, and asking them to come up with great solutions.

[KCoker]

Thanks, and its Nice...the rebuild of No2 differs just a little to the spare 01 in alternator brackets, breather line, braiding for op hose, the lines to the DCO 50's....under carb throttle cable, etc.

In think I know see where the two Cosworth McLaren M81's and Mercury Cosworth Capris fit...its right HERE!!!!





So I'm guessing the race versions were all alloy, and were the same as the BDG Mercury Lynx Rear drive conversion, a sort of RS1700 without the T...

http://www.speedhunters.com/2018/12/...-mercury-lynx/








Every part except the alternator mounting is the same. Throttle linkages and other Weber DCO details







https://bringatrailer.com/listing/1983-mercury-lynx/


I'm quessin' where it came from? M81.., not the Cosworth Capri

The guy that had the two race cars and two street cars was in Northern California. Bet this was in his collection. He had the M81's hid out for the past 30 years. They were sold after his death. I also heard a bunch of parts were sold at estate sale. I found several missing parts to my car on e-bay. The guy got them at an estate sale. Looks like where my motor went.