27 replies to this topic

[whistler]

I'm just rebuilding a 791 1098 engine and it is definitely A series, not A+. Nick is correct in that it is from a Clubman saloon.

[Spider]

Yes, the last of the 1100 engines were A+.

[nollyd]

So how many 1100 a+ were there. Cant find the 791 number anywhere.its not a bodge 998 with an 1100 tag. There were 1100 a+ made.just after info on this.

[Spider]

So how many 1100 a+ were there. Cant find the 791 number anywhere.its not a bodge 998 with an 1100 tag. There were 1100 a+ made.just after info on this.

 

The Small Bore A+ first appeared in 1979. The A+ 1100 Engines were in production for around a year.

 

The 10H791 was the prefix used to all 1100 Engines fitted to the Clubman Saloons.

[nollyd]

Apparently,according to guessworks the 1100 a+ was only produced for about two years,10h791 aaz,however this number and prefix doesnt show on guessworks number checker,so it does exist and its not a bodged 998,just a rare engine.look forqard to rebuilding it tho.

[Ethel]

Yep, the Clubby Estate lived on long enough to get A+. It'd be interesting to see one in the flesh - I can't imagine they developed new rods, head & pistons.

[nollyd]

When i eventually strip it ill post some photos and dimensions,thats if people want to see them.its all original by the looks of it even down to the oil filler cap.

[nicklouse]

When i eventually strip it ill post some photos and dimensions,thats if people want to see them.its all original by the looks of it even down to the oil filler cap.

Just a picture of it now from the front would decide if it is A or A+

[nollyd]

It does have the webbing just below and to the right of the oil filter and 1 hole for the fork clamp on the dizzy.no tube on the dipstick.

[nollyd]

Guessworks verification.  20200215_121247.png   105.38K   4 downloads

[nollyd]

It states a series gear ratio on a+ mainshaft,so what difference would there be,the head is a 12g202,pistons are dished with M2007 E3 on them,any info ?. Havent got pistons out yet so no number from inside piston.

[Spider]

It states a series gear ratio on a+ mainshaft,so what difference would there be,the head is a 12g202,pistons are dished with M2007 E3 on them,any info ?. Havent got pistons out yet so no number from inside piston.

 

The " A+" Gearbox was a progressive introduction over nearly 5 years and there was off the top of my head, about 4 or 5 different 'models / types' before we ended up with the DAM5262. At each stage of development, they had different case casting numbers and they changed one or two items internally. These improvements started back around 1978 through to 83 and even then, there were a few changes they continued with to the early 90's.

 

The Rods and pistons used in the 1100 A+ were the same as those used in the A and it was likely topped with the 12G202 head. It was only the block that was changed and that only occurred because the A had ceased production. The 1100 engines (all small bore types) share exactly the same cylinder block as the 998 engine. The only differences between these engines was the Pistons, Crank, Cam and Head. They did also use a different distributor (for the curve) and a different Needle in the Carb.

[nollyd]

Thats great info,thank you,any idea what dizzy was used,also what carb and needle.