Calling all engine builders!
I'm currently building a 1293 for my mini. The car will be strictly a nice weather, occasionally driven street car. In the quest for more power, I'm going with a Swiftune SW5 cam. Now I need to decide on compression ratio. Is there a consensus on the maximum ratio that will work well with 91 - 93 octane gas? Thanks for any advice!
Mark Crumpley
10:1 all day long on premium. I wouldn't exceed around 10:5:1 on pump fuel.
More power than what? SW5 cam is a mild cam, overated IMHO.
SW5 is a nice street cam, better than stock but still gives a nice smooth idle.
Is a sw5 comparable to a kent 266?
I think it is.....
Well to the original poster I made just shy of 80 to the wheels on 10:1 compression with a 266, worked head, and 1310cc. Pulls down low all the way to 6k rpms.
All right, the votes are in. !0:1 it is! Thanks for the input, guys!
The Nural pistons I use are 10.3:1
Any other details on your ride? I also went with a verto turbo clutch setup and the lightest flywheel available from MED. Couldn't be happier with it. Very easy to drive and a few of the guys here can attest to that.
This will be a pretty conservative build. I'm running 9.75:1 AE/Nural pistons, an 11 lb flywheel with a balanced rotating assembly, modified cylinder head, the aforementioned SW5 cam, single HiF6 and an LCB/single box exhaust. Speaking of SU carbs, I'm open to suggestions for a suitable needle for this set up. While we're at it, does anyone have any experience with an SU-to-Mikuni HSR carb conversion?
http://www.v-performance.com/products/air_fuel.html.
I did one back in 2012 on a 1961 Mini (Mr. Bitsa-FrankenMini) I had.
I used the 42mm kit from that company.
Getting the throttle and choke cables working right was rather tricky. It performed well.
I sold the car a year later. The new owner had it for 5 years before selling it on. I almost bought it back.
Quote from: NormanMini on August 08, 2020, 09:19:56 AM
This will be a pretty conservative build. I'm running 9.75:1 AE/Nural pistons, an 11 lb flywheel with a balanced rotating assembly, modified cylinder head, the aforementioned SW5 cam, single HiF6 and an LCB/single box exhaust. Speaking of SU carbs, I'm open to suggestions for a suitable needle for this set up. While we're at it, does anyone have any experience with an SU-to-Mikuni HSR carb conversion?
http://www.v-performance.com/products/air_fuel.html.
I used a needle recommended from Keith Calverts website for a hif44, and then I had to modify upper stations by filing it down slightly. I have a wideband installed to see exactly what's going on and I highly recommend one for a fast road build.
I would start with a BDK or BDL
I started with BDK which was too lean by a lot. BCE was close for me but needed a smidge more. BDK, BDL, and BCE would be the ones to look at. From his website...
Great input, all. Thanks!