ford sierra 24v engine conversion

twincam77

just wondering whats involved in converting a 2.0 sierra to 2.9 v6 24v using the engine from a granada cosworth.

iv seen a few 2.9 granadas advertised but there all auto , so im wondering what flywheel and gearbox to use?

surley somebody on here has done this conversion or knows somebody who has?????

ianobrien

The Engine you're thinking of is called the Cosworth BOA/BOB (the BOB was the later version). The one to get is the BOA, simply as it's easier to wire in. The BOA/BOB was always mated to auto transmission.

Ford being Ford, the BOA/BOB was based on the Cologne engine as fitted into the Cortina/Sierra/Granada/Transit/Capri etc. So, for a Sierra, you need to find Sierra V6 mounts and flywheel. Sump might have to change to an XR4i or XR4x4, I'm not sure. Gearbox can be a V6 Type 9 (weak when faced with the Cosworth) or a hybrid MT75 of V6 4x4 front half, 2.3 straight 4 tail end.

Think of it this way, you'll have to basically convert the 2.0 Sierra into a XR4i or XR4x4 under the bonnet and instead of dropping a 2.8/2.9 Cologne, drop in a BOA/BOB. It's quite common conversion on Cortina's and Carpi's. Corktina will know more no doubt.

Word of warning, not all 2.9 Granadas had the Cosworth engine. Most had the ol' pushrod Cologne.

_Conrad_

twincam77 wrote: »

just wondering whats involved in converting a 2.0 sierra to 2.9 v6 24v using the engine from a granada cosworth.

iv seen a few 2.9 granadas advertised but there all auto , so im wondering what flywheel and gearbox to use?

surley somebody on here has done this conversion or knows somebody who has?????

You should actually talk to someone like Saff24v on everyfordireland, as his drift car is a sierra with 24v conversion.

If you were buying a whole sierra and didn't mind ending up with 5 stud wheels you could fit the granada cosworth's brakes as they're better than the sierra's. Wheels woudl then need to be 5x112 pcd same as mercs and big vws/audis.

Gearbox is a "hybrid" mt75, V6 bellhousing is needed to fit onto the 24v then a normal 4cylinder 2wd MT75 box.

If i'd known you were going to want to convert that sierra you got to a cosowrth 24v i could have pointed you in the direction of one that was already done, would have been cheaper than buying a tidy 2 litre and converting it. But you may have been put off that one as it's changed to 2.9 on the taxbook etc (which in my view is only right as at least then you have valid insurance etc, but must 24v sierras are 1.6 and 1.8s on the taxbook usually)

twincam77

Gearbox is a "hybrid" mt75, V6 bellhousing is needed to fit onto the 24v then a normal 4cylinder 2wd MT75 box.

If i'd known you were going to want to convert that sierra you got to a cosowrth 24v i could have pointed you in the direction of one that was already done, would have been cheaper than buying a tidy 2 litre and converting it. But you may have been put off that one as it's changed to 2.9 on the taxbook etc (which in my view is only right as at least then you have valid insurance etc, but must 24v sierras are 1.6 and 1.8s on the taxbook usually)[/QUOTE]

thanks for the reply conrad, era i dont mind converting the sierra i have to 2.9 twill be something to do for the dark nights ahead!

so basically i need a 2.9 v6 granada theres a few on dondeal in limos and hearses yes??

and ive been told that i can use my own 2.0 gearbox but with an xr4x4 bellhousing and spigot shaft??

twincam77

ianobrien wrote: »

The Engine you're thinking of is called the Cosworth BOA/BOB (the BOB was the later version). The one to get is the BOA, simply as it's easier to wire in. The BOA/BOB was always mated to auto transmission.

Ford being Ford, the BOA/BOB was based on the Cologne engine as fitted into the Cortina/Sierra/Granada/Transit/Capri etc. So, for a Sierra, you need to find Sierra V6 mounts and flywheel. Sump might have to change to an XR4i or XR4x4, I'm not sure. Gearbox can be a V6 Type 9 (weak when faced with the Cosworth) or a hybrid MT75 of V6 4x4 front half, 2.3 straight 4 tail end.

Think of it this way, you'll have to basically convert the 2.0 Sierra into a XR4i or XR4x4 under the bonnet and instead of dropping a 2.8/2.9 Cologne, drop in a BOA/BOB. It's quite common conversion on Cortina's and Carpi's. Corktina will know more no doubt.

Word of warning, not all 2.9 Granadas had the Cosworth engine. Most had the ol' pushrod Cologne.

would a 2.9 granada hearse or limo have the cosworth engine? theres a few on dondeal at the minute

would this engine do the job or would i specifically have to get an engine form granada cosworth?

http://cars.donedeal.ie/for-sale/vintagecars/2237804

ianobrien

twincam77 wrote: »

would a 2.9 granada hearse or limo have the cosworth engine? theres a few on dondeal at the minute

would this engine do the job or would i specifically have to get an engine form granada cosworth?

http://cars.donedeal.ie/for-sale/vintagecars/2237804

The Granada Cosworth is a rare beast. I've only ever seen three or four of them. The twin plenum 2.9 Cologne is the usual fitment for hearses and limos. If the car was a Granada Cosworth, it would be advertised as such.

twincam77

ive found an 84 xr4i 2.8 2wd sierra manual, can i use any parts from this car to get me going?

gearbox, flywheeel etc

ianobrien

twincam77 wrote: »

ive found an 84 xr4i 2.8 2wd sierra manual, can i use any parts from this car to get me going?

gearbox, flywheeel etc

I have never done the conversion, I only thought about it before, so bear that in mind....

With that said, I imagine that engine mounts and flywheel most certainly. Gearbox will fit, but will probably break under strain. If it was available, I'd take the whole car. you never know there might be something else needed. Also, the rear windows and spoiler were unique to the XR, so might be worth a bit. While you're there, grab the rear arms for the disc brakes and take the master cylinder. With the 24V up front, uprated brakes might help......

S Line

Slightly off topic

The Cosworth 24V transplant seems to be a popular on the blue oval scene. Is it fair to say that virtually no 24V powered Granada’s will survive because of this. That this is a bigger threat to Granada survival than banger racing ???!!!

Some would say that it’s no more than the ugly ass Scorpio deserves (not me though, I like its dodgy looks)

mk1 gran

use the mt75 gearbox because they stronger and the 2.9 flywheel.mt75 gearbox can be made up from a 2.9 4x4 bellholding and a 2ltr mt75 as 2ltr bellholding wont match the engine. 2.8 gearbox can be used too but wont last as they blow to bits with the boa engine! am restoring a mk1 granada at the min and puttin a boa engine in it.

twincam77

mk1 gran wrote: »

use the mt75 gearbox because they stronger and the 2.9 flywheel.mt75 gearbox can be made up from a 2.9 4x4 bellholding and a 2ltr mt75 as 2ltr bellholding wont match the engine. 2.8 gearbox can be used too but wont last as they blow to bits with the boa engine! am restoring a mk1 granada at the min and puttin a boa engine in it.

so basically am i right in saying that i can use my own 2.0 glsi gearbox but with the bellhousing from a 2.9 xr4x4i

and also the flywheel from the same 2.9 xr4x4i??

ianobrien

twincam77 wrote: »

so basically am i right in saying that i can use my own 2.0 glsi gearbox but with the bellhousing from a 2.9 xr4x4i

and also the flywheel from the same 2.9 xr4x4i??

Silly me! I assumed your Sierra was a Pinto/Type 9 combo! What gearbox does your car have?

mk1 gran

twincam77 wrote: »

so basically am i right in saying that i can use my own 2.0 glsi gearbox but with the bellhousing from a 2.9 xr4x4i

and also the flywheel from the same 2.9 xr4x4i??

you need gearbox from twincam sierra or granada. go to fordpower forum and it show all about converting. hope that help.

twincam77

my sierra is a 1992, 2.0 twincam efi, glsi,.