long stroke turbo.
Turbo Mini Forums

ive decided that im not going to do the 998 with the +80 thou and turbo it i think its going to be more practical to build a big bore engine, and thats what im going to do, i want to build a 1480 turbo :), should be fun off boost and on boost. however what are the implications of this?

i have a problem in my head about it not spooling the turbo very well, or am i thinking up cobblers again?

Thanks

Sam.

i think it will be laggy as hell, also not sure for certain but i notice the largest people go is 1380, weather this has anything to do with bore flex and the lagg factor i am not sure, but i will say running ure setup will need some hefty ass dishes in the pistons and the head otherwise ure CR will be sky high, my 1480 was running 14:1 granted it was a high comp head though. for what you would pay to get cranks stroked and the block machined (not to mention the implications it will cause going that big, ie oil galleries being ruptured as per mr vizards explanation on big bore motors) you would get very little benefit in the BHP count, go 1380 with the accralites and if you have cash (which you must to consider 1480 ) get ure crank lightened wedged etc, and the whole thing balanced ie pistons rods and flywheel) IMHO of course.

if i had the doe i would go 1380, accralite pistons, Benross head, cranks setup i have mentioned, hybrid turbo about 20 psi boost and a custom made charge cooler :) each to their own.

______________________________________________________
TRADER HALL OF FAME
BENROSS...MINIMARK..WOLFIE (comic genius).....CARL....MARTPAUL.......AXEL
______________________________________________________
TRADERS OF SHAME
1 user....pm me 4 details

LEGENDS
MikeRace, Mini13

i should go 1380 then basicly?

why do these dam youtube vids inspire me!

Hi,
I think the 1380 should give you what you want. After all the 1275s aren't short on power, but the should be less stressed for the same output.
How much power are you looking for?
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

i still want to build a 1430 turbo, got most of the parts together last year but was having trouble figuring out what pistons to use. ended up just refurbing my 1293 in the end.

accralites? as its 73.5 mm bore

im gona go for a 1430 supercharged jobbie, with a 16v head, not worked out all details as yet but i want it want it want it!
i know im gona have to lower compression a hella lot im just hoping ill be able to chop a bit out the head (scurries off to look at the cross sectional cut) and pistons aswell.
i was told that bore flex is only a major problem on ally block, obviously they wont be as strong

David.

ally block pah, thats the problem with them! and also i may be speaking cobblers again today but wouldent it just violate head gaskets as the head and block expand at diffrent rates?

i like the idea but its not worth all the trouble.

not saying theres an ally a-series block btw just mentioning when ally block are used in other cars and when the bores get overly thin

David.

I think the long stroke route could be a good idea,

One issue is that you'll wend up with a whippier weaker crank, but as most turbo's dont reve massively high this may not be too much of an issue.

The main issue in my mind though is getting the CR down enough, with the A head the chambers can be made pretty large, but with a K or the 7 port like I haveyour going to be needing pistons of more thsan 18cc probably 20 or 22.

The BK450 gasket could cause probs as it can overhang the bore on a 73.5mm bore, you could use the other copper gasket (AFG somthing?) or go to one of those fancy solid copper gaskets Comtec or cometic?

the larger capacity should help to make a turbo less laggy, as ther will be more volume passing through the turbine an low speeds (off boost)

The increase in capacity is going to give something like 10-15% more power.

However, you can achieve the same increase with an extra 2psi of boost.

Hence, it would be more cost effective to spend the money on the drivetrain to handle the power.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Wolfie?

longer strokes make torque and torque makes power
a turbo is a torque multiplier

its the right way to go but its the cash aspect and what the chaps have mentioned above

1380 cc with accralite pistons 18cc dish and 28cc in the head gives a good ballance allround especialy in the back pocket, but.............if you have the cash go for it

yep i have a long stroke turbo

Laggy as hell, I would have thought it would be a great idea and less laggy.

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

i have no lag really

do you have an action vid or anything wolfie?

theres one on you tube

i have been in neils car and the lag is pritty much non existant he put his foot down and christ i got shot back into the seat it was the insperation for me to go turbo'd.

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

Searching is all you need on TurboMinis

that an 88 mm stroke?

I think wolfie's is approx 1350cc

+40 with 84mm stroke.

wolfie could you give us the link on youtube please and the pistons and stroke you are using

also the pit falls you came across building this extra stroked monster buddy

1355cc
84.3mm crank
http://www.youtube.com/watch?v=kjZXnuIgHL0
http://www.youtube.com/watch?v=SoC6WCik3n0
i have had a problem with the crank, cause unknown at the moment

Edited by wolfie on 30th Oct, 2007.

whats the problem ?

Dont know if this helps for the lag point of view but im sure i read turbos dont like to be pulsed , by having a short stroke would the generally lower revs but higher volume pulse the turbo.