21 replies to this topic

[matto224]

Hey guys! I have a 1995 spi rover and im looking to start on engine upgrades to give it a little more power, im new to minis so still learning!

I understand spi engines are much harder to tune than carbd engines (i wanted a carbed engine but chose bodywork over engine)

Can anyone point me in the right direction for starters? I was thinking of a exhaust system anyone recommend a good system?

Thanks !!

[psmini]

Hi,

 

My Mayfair's engine has been rebuilt and rebored to 1293cc, had a stage 4 head, kent 274 cam and an LCB/RC40 exhaust system and K+N air filter.  Now has 53bhp at the wheels.  Still has the spi system.  Its built for reliability, could get way more power with a carb but the rolling road guy (Southam mini centre) commented on what a strong and well balanced engine it is.  I'd suggest going for the exhaust and an air filter to give an instant boost and it will sound nicer too.

[matto224]

Hi,
 
My Mayfair's engine has been rebuilt and rebored to 1293cc, had a stage 4 head, kent 274 cam and an LCB/RC40 exhaust system and K+N air filter.  Now has 53bhp at the wheels.  Still has the spi system.  Its built for reliability, could get way more power with a carb but the rolling road guy (Southam mini centre) commented on what a strong and well balanced engine it is.  I'd suggest going for the exhaust and an air filter to give an instant boost and it will sound nicer too.

Hi! Thank you for your reply :) youve certainly had some work then, bet it drives lovely, if you dont mind me asking, is it expensive the work youve have had done? 53bhp doesn't sound a lot does it but in a mini bet it pulls! Wheres a good place to get an exhaust system? I have a k&n air filter :)

[Steve220]

Hi,
 
My Mayfair's engine has been rebuilt and rebored to 1293cc, had a stage 4 head, kent 274 cam and an LCB/RC40 exhaust system and K+N air filter.  Now has 53bhp at the wheels.  Still has the spi system.  Its built for reliability, could get way more power with a carb but the rolling road guy (Southam mini centre) commented on what a strong and well balanced engine it is.  I'd suggest going for the exhaust and an air filter to give an instant boost and it will sound nicer too.

Hi! Thank you for your reply :) youve certainly had some work then, bet it drives lovely, if you dont mind me asking, is it expensive the work youve have had done? 53bhp doesn't sound a lot does it but in a mini bet it pulls! Wheres a good place to get an exhaust system? I have a k&n air filter :)

Thats an ATW figure, it's most likely 70 at the fly.

[matto224]

Thats an ATW figure, it's most likely 70 at the fly.[/quote]

Ahh i knew that!! ;)

[Zach P-D]

I have a 95 SPI, Currently have a stage 3 head to go on from CalverST, 1.5:1 rockers and a few other goodies, future plans are a Piper BP255 cam. I also have a straight through Fletcher system installed too :), Keith at CalverST said my set up should make about 80-85 ish bph

[r3k1355]

You can get upgrade packs or buy individual parts yourself.

For example the Mini Sport stage 3 kit will get you near 85bhp at the fly and costs about £1300.

 

If you don't want to spend that much in one go then you could buy used or individual parts, and do bits and bobs as you can afford

[matto224]

I have a 95 SPI, Currently have a stage 3 head to go on from CalverST, 1.5:1 rockers and a few other goodies, future plans are a Piper BP255 cam. I also have a straight through Fletcher system installed too :), Keith at CalverST said my set up should make about 80-85 ish bph

Sounds good that does mate! How do you get around the MOT with a straight through exhaust?

[matto224]

You can get upgrade packs or buy individual parts yourself.
For example the Mini Sport stage 3 kit will get you near 85bhp at the fly and costs about £1300.
 
If you don't want to spend that much in one go then you could buy used or individual parts, and do bits and bobs as you can afford

I was looking at the packs on mini sport last night! Im probably going to buy parts individual parts and do her up slowly, firstly i was looking at this maniflow back box , https://www.minispor...abs_description

Will be a good starter i think?

[Steve220]

You can get upgrade packs or buy individual parts yourself.
For example the Mini Sport stage 3 kit will get you near 85bhp at the fly and costs about £1300.
 
If you don't want to spend that much in one go then you could buy used or individual parts, and do bits and bobs as you can afford

After recent discoveries, i'd be wary about minisport's cylinder heads... or just the company in general.

Edited by Steve220, 24 January 2018 - 12:46 PM.

[matto224]

You can get upgrade packs or buy individual parts yourself.
For example the Mini Sport stage 3 kit will get you near 85bhp at the fly and costs about £1300.
 
If you don't want to spend that much in one go then you could buy used or individual parts, and do bits and bobs as you can afford

After recent discoveries, i'd be wary about minisport's cylinder heads... or just the company in general.

Ahhh okay! What discoveries if you dont mind me asking?

[Steve220]

Claiming 3 angle valve seats and then only having one.

[psmini]

 

 

Hi,
 
My Mayfair's engine has been rebuilt and rebored to 1293cc, had a stage 4 head, kent 274 cam and an LCB/RC40 exhaust system and K+N air filter.  Now has 53bhp at the wheels.  Still has the spi system.  Its built for reliability, could get way more power with a carb but the rolling road guy (Southam mini centre) commented on what a strong and well balanced engine it is.  I'd suggest going for the exhaust and an air filter to give an instant boost and it will sound nicer too.

Hi! Thank you for your reply :) youve certainly had some work then, bet it drives lovely, if you dont mind me asking, is it expensive the work youve have had done? 53bhp doesn't sound a lot does it but in a mini bet it pulls! Wheres a good place to get an exhaust system? I have a k&n air filter :)

Thats an ATW figure, it's most likely 70 at the fly.

 

You're exactly right - 70 and the flywheel.  Originally it had 53 at the flywheel so a fair increase.

[Zach P-D]

Stay away from Minisport heads, only heard bad. This is the bloke you want to talk to about heads, I got further with him in an hour than with other companies in a month. https://www.calverst.../cylinder-head/

Also as to how I get through MOT, I just have a friendly MOT man     

Finally, if you're looking a exhausts I have the whole system from LCB back with a cat link pipe that I could sell, it's a single box RC40 and did sound nice. 

[psmini]

 

Hi,
 
My Mayfair's engine has been rebuilt and rebored to 1293cc, had a stage 4 head, kent 274 cam and an LCB/RC40 exhaust system and K+N air filter.  Now has 53bhp at the wheels.  Still has the spi system.  Its built for reliability, could get way more power with a carb but the rolling road guy (Southam mini centre) commented on what a strong and well balanced engine it is.  I'd suggest going for the exhaust and an air filter to give an instant boost and it will sound nicer too.

Hi! Thank you for your reply :) youve certainly had some work then, bet it drives lovely, if you dont mind me asking, is it expensive the work youve have had done? 53bhp doesn't sound a lot does it but in a mini bet it pulls! Wheres a good place to get an exhaust system? I have a k&n air filter :)

 

Thats at the wheels, its 70 ish at the flywheel.  In total it came to under £2k which was fully built which I know is a bargain, the garage that did it isn't around anymore.  I supplied the head from a guy I found on ebay who builds them in his spare time but even with that, I got it within the £2k.  Id recommend minispares, my whole system is RC40 including the Playmini style stainless backbox.