1943 replies to this topic

[HARBER07]

what the hell Ben?. Everyone knows red bits are faster!!

[mini_mad69]

what the hell Ben?. Everyone knows red bits are faster!!

I know, but all my engines have been red so far, and it just doesnt do anything for me. So im going for black/alloy and blue.

Im think it will suit the car better, I'll take the horsepower reduction for a bit of stealth and i think black looks a bit more subtle.

[HARBER07]

May have make up the difference with nitrous.

[CaptainBland08]

May have make up the difference with nitrous.

or a ******* load of boost:P

[mini_mad69]

Don't worry im on the case for both of those!!

Although I've not got the transmission to take much power yet. So will be build and run the 1380 N/A
Get it on boost and run a bit more power. Save up for a decent transmission and then let loose as much power as possible.

[mini_mad69]

Just spent a couple of hours knocking up a spreadsheet that will work out all figures for putting together an engine.

Assuming I have a deck height of around 40 thou, with a 28cc head I should get a 9.1:1 compression ratio, which with my cossie intercooler I should be able to run 10psi when I convert to turbo. This is a big load off as I was thinking I wasn't going to be able to get the compression ratio low enough with the 1380, and would have to build a new engine.

The current 1380 build will be around 10.7:1.

[mini_mad69]

Bottom end built and spinning freely.


End float checked and good.



Before and after of pistons.



Fitted piston 1 and it was pretty stiff to turn over once torqued.

Does anyone know if the tabs of the big ends are meant to be together or opposites?



Oposites.



And together.

[samsfern]

looking good, im pretty sure the tabs on the bearings should be opposite each other, thats how ive always done it anyway.

So, whats better turbo wise, running higher compression ratio with lower boost, or lower compression ratio with higher boost?

[mini_mad69]

looking good, im pretty sure the tabs on the bearings should be opposite each other, thats how ive always done it anyway.

So, whats better turbo wise, running higher compression ratio with lower boost, or lower compression ratio with higher boost?

What are you aiming for, all out power? Drivability, MPG?

I will running a comression ratio of around 9:1, and around 10 PSI. From previous builds I've seen this will be between around 130 ish HP. Should retain good MPG, and running a 266 kent cam at 9:1 on a 1380 should retain some pretty good off-boost power.


I think I put it in with the tabs at opposite end aswell, will have to double check, im using Wynns oil treatment to lubricate it as I assemble, maybe I could try something a bit thinner, as I seem to remember having this problem before, and using 20w50 kept everything rotating nicely. I can't remember now, it might even say in this thread somewhere.

[samsfern]

i want to have power there, driveability, ive got a race cam in mine at the mo, with no power below 3-3.5k, so not worried about driveability, lol, id like to see better mpg, can just about manage 30 at the moment, if i drive slow like my nan does, lol, but i realise i cant have everything, lol. Ill be using a minisport ca2 cam.

I were thinking of going for 8.5:1 c/r and 15 psi boost, what you reckon?

Edited by samsfern, 27 December 2010 - 09:45 PM.

[HARBER07]

[danrock101]

sounds like it's going to be a nice motor to drive,
what's the plans gearbox wise?
X-pin and S/C drops?

[mini_mad69]

i want to have power there, driveability, ive got a race cam in mine at the mo, with no power below 3-3.5k, so not worried about driveability, lol, id like to see better mpg, can just about manage 30 at the moment, if i drive slow like my nan does, lol, but i realise i cant have everything, lol. Ill be using a minisport ca2 cam.

I were thinking of going for 8.5:1 c/r and 15 psi boost, what you reckon?

That sounds good. As long as you've got a decent intercooler you shouldn't have too much trouble. It's probably worth going down the megajolt route just so you can get that ignition spot on. Good thing about turbo's is that keeping them off boost should see some decent MPG seen, but then take your head off when you plant it. I've got to admit I don't know what the ca2 wil be like, as I've never heard of it.

Off boost im thinking on a run I should be seeing 35+ MPG.

[mini_mad69]

sounds like it's going to be a nice motor to drive,
what's the plans gearbox wise?
X-pin and S/C drops?

X-Pin when the turbo goes in, but just a strong pin in a standaraad diff for the N/A. Im always skint at the moment and just can't afford one yet.

Im going to try to get away with standard helical drops for now, people on turbo minis are getting away with using them with alot more power than what I have planned, but will invest if I start to see them getting trashed.



What do people reackon on building an engine using 20w50?

[HARBER07]

I've built a couple A series with 20/50 and its been OK, but if you can get some of this -



It's the shizz!. Well handy if the engine is gonna be sat for a while.