23 replies to this topic

[shorty]

hmm so many ideas lol

[shorty]

right so the plan is when i get some money
i may get my 998 bored out to a 1071 spec engine so aiming for 70bhp or there abouts. (not sure whether that is at the fly or at the wheels as the site i found didn't say. So any info on that would be useful)

What would i be looking at to pay for a rebore and possible refurb of the engine aswell.
Where would be the best place to get this done? any recommendations?

edit: just been reading something that says the 1071 is an 850 bored out.
will i still be able to gain the same power from my 998 A+ lump if it was bored out to a 1071 or would it be different?

Edited by shorty, 15 July 2009 - 11:25 PM.

[Pauly]

You would get a power inecrease if bored out to 1071 mate, more cc's. But you would need uprated cam and some head work doing.

Paul.

[Rosslin Racing]

you cant bore an 998 out to a 1071 can you? the real 1071 has the same bore size as the 1275 and the crank had a diffrent stroke. an over bored 998 will give you 1060

[shorty]

you cant bore an 998 out to a 1071 can you? the real 1071 has the same bore size as the 1275 and the crank had a diffrent stroke. an over bored 998 will give you 1060

good thing i new that before i decided to get it done

i see that a 970 engine has the same bore as the 1071 just smaller MM stroke

if i got an 850cc engine could that be bored out to 1071 size

[jaydee]

you cant bore an 998 out to a 1071 can you? the real 1071 has the same bore size as the 1275 and the crank had a diffrent stroke. an over bored 998 will give you 1060

Correct, exactly what i thought, its the 850 engine that can be bored to a 1071.

[Rosslin Racing]

you cant bore an 998 out to a 1071 can you? the real 1071 has the same bore size as the 1275 and the crank had a diffrent stroke. an over bored 998 will give you 1060

good thing i new that before i decided to get it done

i see that a 970 engine has the same bore as the 1071 just smaller MM stroke

if i got an 850cc engine could that be bored out to 1071 size

No. I would not bore an 850 over the factory tolerances. some are not so good when bored out. mainly the early 60s blocks bit thin in places.

[liirge]

My 998 is being bored out to 1096, and you can go bigger,
The reason the 1071 works so well is because its so close to Square, to get a 998 on its crank you have to overbore further than 1096 infact i think its impossible to get that crank and bore ratio even close to Square, now if you want advice on tuning a 998 please PM me, i have a Build thread on here aswell.
The following topic may also help you, and im currently in the stages of writing a guide on Tuning a 998.
http://www.theminifo...Overbore engine

[shorty]

edit: may think about tuning the 998 actually then get engine bored to a certain size when i have the money
will PM you sometime soon liirge

just thinking of ideas for the near future and a 1071 or as close as i can get either side of that may be the way i go.

will go look at your thread though

Edited by shorty, 16 July 2009 - 02:24 PM.