22 replies to this topic

[danwebster]

What about a N/A 8 porter with 16 valves on a jack knight 6 speed box revving to 9200?

[Retro_10s]

1071, supercharged 8 port on a jack knight 6 speed box

They do a 6 speed as well as the 5 speed? woopwoop!

Edited by Retro_10s, 11 April 2007 - 04:31 PM.

[*DJH*]

What about a N/A 8 porter with 16 valves on a jack knight 6 speed box revving to 9200?

No way! surely not!

[who_loves_the_mini?]

the 6 speed is about £2800, they dont have any left so it would have t be specially built

[JetBLICK]

Yea JK ave done 6 speed boxes for a while now, tho, to be honest, i cant see the point. I certainly wouldnt want to be going far over 100 mph in a mini, maybe 120 tops. The other use is economy, but thats just boring. I think 5 speed will do :boring:

As for short stroke, theres no easy way. If you want to go nearly short stroke, at a comparatively smaller cost get a 1275 crank offset ground from 81mm to 78mm (i think its 78?) then use cooper s rods. Its the same way they do 1430's, 'cept your grinding it the other way. Obviously this aint short stroke, even with a 74mm bore, but its closer

Or you can do what others have suggested and use a 1071 or 970 crank. For this you have to use cooper s conrods. As for the block, you have the choice of finding a cooper s block (any of the three 970, 1071, or 1275) or u can use a normal 1275 block apparently, but you have to have specially made thrust washers or something? If you do use a 1275 block, theres no problem with skimming the top down, it still leaves plenty of metal. A chap on minifinity tried it (successfully) after reading that it can be done in vizards book.

Another thing you can do is get a billet crank made, to get one made by swiftune would cost in the region of £1300. Or if you like the guy at specialist components, a while ago, offered to make a batch of 1071 billet cranks, if people could organise a group buy. Now considering his billet 1275 crank is £200 cheaper that most of the other billet alternatives (£800 opposed to £1000? prahaps if enough people wanted it we could organise something???

The final option it to try and find a south african 1071 crank. They are made from the same EN40B steel, and have the same stroke, but, from what i've found out, they have the same journal size's as a standard 1275 engine, making them easer to just plonk into a normal 1275 block, without the cooper s rods, or the custom thrust washers. I dont know much about these yet. I emailed a guy in new zealand who can apparently source them the other day and am awaiting his reply.

I've called a few people who can apparently supply 1071 parts, but they always seem really arsey. Usually i get asked "why do you want a 1071?" followed by "theres no point for a road car, why not just get a 1380?" then when you explain its not for a cooper s resto, or an autograsser they just start to fob you off, by saying "i'll see what i can find and give you a call back"
You just gotta keep looking i guess.....

I'm hoping to start building my short stroke motor soon too, just as soon as i've finished the other aspects of the car, then i can just concentrate on building my dream motor

Edited by JetBLICK, 11 April 2007 - 07:39 PM.

[roofless]

best engine i ever had was base around a south african 1071 crank supplied by a friend in jo-berg. no-one believed the spec and all insisted it must have much bigger cc's and couldnt have revved to the limits it did.

short precise strokes - always good my world

[danwebster]

What about a N/A 8 porter with 16 valves on a jack knight 6 speed box revving to 9200?

No way! surely not!

Not mine, my brothers.....he's been running the 6 speed dog box for about 5 years now....its an awesome piece of kit and perfect for a high revving engine!

[fishy]

Yea JK ave done 6 speed boxes for a while now, tho, to be honest, i cant see the point. I certainly wouldnt want to be going far over 100 mph in a mini, maybe 120 tops. The other use is economy, but thats just boring. I think 5 speed will do :boring:

As for short stroke, theres no easy way. If you want to go nearly short stroke, at a comparatively smaller cost get a 1275 crank offset ground from 81mm to 78mm (i think its 78?) then use cooper s rods. Its the same way they do 1430's, 'cept your grinding it the other way. Obviously this aint short stroke, even with a 74mm bore, but its closer

Or you can do what others have suggested and use a 1071 or 970 crank. For this you have to use cooper s conrods. As for the block, you have the choice of finding a cooper s block (any of the three 970, 1071, or 1275) or u can use a normal 1275 block apparently, but you have to have specially made thrust washers or something? If you do use a 1275 block, theres no problem with skimming the top down, it still leaves plenty of metal. A chap on minifinity tried it (successfully) after reading that it can be done in vizards book.

Another thing you can do is get a billet crank made, to get one made by swiftune would cost in the region of £1300. Or if you like the guy at specialist components, a while ago, offered to make a batch of 1071 billet cranks, if people could organise a group buy. Now considering his billet 1275 crank is £200 cheaper that most of the other billet alternatives (£800 opposed to £1000? prahaps if enough people wanted it we could organise something???

The final option it to try and find a south african 1071 crank. They are made from the same EN40B steel, and have the same stroke, but, from what i've found out, they have the same journal size's as a standard 1275 engine, making them easer to just plonk into a normal 1275 block, without the cooper s rods, or the custom thrust washers. I dont know much about these yet. I emailed a guy in new zealand who can apparently source them the other day and am awaiting his reply.

I've called a few people who can apparently supply 1071 parts, but they always seem really arsey. Usually i get asked "why do you want a 1071?" followed by "theres no point for a road car, why not just get a 1380?" then when you explain its not for a cooper s resto, or an autograsser they just start to fob you off, by saying "i'll see what i can find and give you a call back"
You just gotta keep looking i guess.....

I'm hoping to start building my short stroke motor soon too, just as soon as i've finished the other aspects of the car, then i can just concentrate on building my dream motor