question for turbo_dave
Turbo Mini Forums

t

someone on here a little while ago told me that to fit a turbo to my standard 1275 mg engine i would have to lower the compression ratio and to do that you have designed a plate that goes in-between the head and block! is this true? if so will you sell me one and how much?? thnx for the help, si

1 Votes - 0%

it may b small but it purfectly formed
http://photobucket.com/albums/v340/1976_mi...roject%20turbo/

sory messed up the post!! it should read:-
someone on here a little while ago told me that to fit a turbo to my standard 1275 mg engine i would have to lower the compression ratio and to do that you have designed a plate that goes in-between the head and block!
is this true?
if so will you sell me one and how much??
thnx for the help, si

it may b small but it purfectly formed
http://photobucket.com/albums/v340/1976_mi...roject%20turbo/

poll to ask a question , this getting silly now

Everyone knows that instructions only have to be read if the thing doesn't work....

Have designed one, tis true.
Trouble is i never considered what it does to the valve train geometry. Basically, it's lifting the head and rocker gear by 2.5mm, hence the pushrods are too short...

I'm thinking of options for getting round this 'little problem'. Suggestions anyone?

custom made push rods that are 2.5mm longer prehaps??

such a simple answer. The price of those you could probably buy a set of omegas!

Take it that adjusting the standard rocker clearance adjusters is a bit dodgy??? If so wot about different adjusters or (involves engine out/part strip down) some type of shim in followers!

-MINI CLUBMAN 1380 TURBO-

screw the adjusters right out

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Must be similar with the "two headgasket theory
" then?

Previous Engine: 1040cc Morespeed engine, 1275 turbo head T2 Turbo Mirage Manifolds Megajolt
Previous engine: STD metro turbo, megajolt
Drives: 399bananahp (flywheel) Honda Civic Vtec b18c4 T28 Turbo 1968 Mini

Megajolt maps to download: http://www.jamesfawcett.co.uk/cms/index.ph...&gid=3&Itemid=3

Thing with rockers is you need to adjust them such that you optimise your lift over the ratio...

Edited by turbodave16v on 7th Jun, 2004.

There are two different lengths of pushrods found in A series engines. the longer ones are about 10mm longer (if my memory serves me correctly).

I always get confused if the longer ones were fitted in the 1275s or the 998s. I think the longer ones were fitted in the 1275s, so probably not much help to you.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

yup the 1275 block is taller than the 998 block so the push rods are longer...

Its easy to shorten, but much harder to lengthen!!!

Alex

AlexF

Not sure if this is a good or bad idea, but the cam followeres are basically a bucket so can the thcikness of the base of the follower be changed such that it lifts the pushrod up by the required amount?

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

You've got the right idea Ben - best place to add packing pieces is in the follower 'bucket'. Only trouble is actually getting something into the bucket without stripping the engine is not happening...

Once again we have the 998 / 1275 block confusion. I am acustomed to the 998 block with the back plates allowing easy access to the followers, not something you 1275 guys have. They do have a habit of pissing oil everywhere though....

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

What about taking some matL of the bottoms of the rocker pillars?

Sooperdooperturbocooperexpertengineering!

Then the valve spring side of things is un happy!

alex

AlexF

i think... but not sure, but you should only need about 1mm off the pillars. shouldnt affect the geometry too much.

could do with all the sizes to work it out.

what about longer adjusters.

OR take the lock nuts of the rockers and put them on the undersides....

just brainstorming!!

Edited by mini-marauder on 7th Jun, 2004.

Sooperdooperturbocooperexpertengineering!

Longer adjusters are possible... and avaible!

Alex

AlexF

errr.... just done some quick calcs and if you use a 2.5mm spacer, and an extra gasket, you would be looking at the low 6's to 1 CR (about 6.2:1) also, you would be looking at nearly 3.5mm of extra height....

shirley plate could be thinner??

will have a look 2morra and see how long adjuster will go.

Sooperdooperturbocooperexpertengineering!

Add some weld to the bottom of the push rod and then machine down to the correct height. If a small bore was drilled into the pushrod, that could be used as a root for the weld ????????

9 valves, 4 wheel drive, 3 cylinders, 1 turbo, which got nicked