|
|
Post by mk1morris on Nov 18, 2009 21:29:30 GMT
just wondering what the top speed of a standerd 1275 carb mini as i seem to lake power top end  |
|
|
|
Post by Simon1275mpi on Nov 18, 2009 22:31:07 GMT
Well you've a 70bhp (ish) MG metro 1275? Assuming its at 70bhp, you should be able to reach a ton (On a race track or AutoBahn!) Knowing you I assume you've been to Gerald and have a healthy car . Setup engine, no binding brakes, flat tyres etc  Gearing maybe... What rpm do you have at 60mph in forth gear or what indicated speed at 3000rpm in forth? Suspect you have the orginal 3.44 metro final drive (for larger wheels!) limiting your top end and economy. Should go like a rocket though ;D |
|
|
|
Post by Miniböttcher on Nov 18, 2009 22:32:04 GMT
you more than likely have a 3.44 diff ratio which gives you more accellerate than top end, but it will drive happy at 70mph at sensible revs
top speeds depends on the condition of your engine, wheel size, diff ratio,
its not something you worry about, but more to worry if it reving it nuts off at 70mph
does it seem better now you have a HIF44 carb
|
|
|
|
Post by Miniböttcher on Nov 18, 2009 22:33:31 GMT
looks like we were writing that at the same time simon
|
|
|
|
Post by mk1morris on Nov 18, 2009 23:24:54 GMT
The power off the line is amazing but im only hitting 75 along the flat, foot to the floor but it gets there fast and screems like a teenager. ;D booked into geralds next week as hes away, but with the nikki carb i was getting 67 bhp. It feels more powerfull with the hif 44 and power is instant but not top end. Its got a standerd mg metro neadle etc in the hif44. surly top end would be more.
The spec of my engine is -
Source Vehicle : MG Metro
Engine type & CC : A+ 1275 cc Transverse mounted
Fueling :
Engine features : Pre-engaged starter
1985 Requirements
Breakerless (electronic) ignition
Cold Climate specification
Gearbox features : Std. Ratio Rod Change gearbox with Pot Joints
3.4:1 Final Drive
|
|
|
|
Post by mk1morris on Nov 19, 2009 0:34:14 GMT
dont now if this is any help it was taken from the last rolling road i had with the nikki carb on
MAX TORQUE SPEED 4413 RPM (53.7 MPH IN GEAR USED)
MAX ENGINE TORQUE 71.9LB FT
MAX ROAD SPEED REACHED IN TEST 74.4 MPH
MAX ENGINE SPEED REACHED IN TEST 6114 RPM
AMBIENT TEMP 22 0C
BAROMETRIC PRESSURE 1000 MB
things have obviously improved a bit since putting hif44 on but do these readings seem right to you guys coz thay mean nought to me lol
|
|
|
|
Post by bigtony on Nov 19, 2009 10:17:56 GMT
ur car dose more than 75 mate i think ur speedo cabel out we wasdoing 75/80 down winchelcy road the other day
|
|
|
|
Post by Simon1275mpi on Nov 19, 2009 14:55:13 GMT
Checked out your 6100 rpm, 74mph and in third gear (which Gerald does from memory) does work out as a 3.44. www.guess-works.com/Gearbox/Technical/ratio.htmA 3.1 diff (My preferred balance diff... ;D) would put you at 83mph at the same rpm/gear. 70mph at 3600rpm in forth. So you've just slapped on a carb and ragged it  tut tut. Wait till Gerald tinkers with the needle and timing  Dean, your just toooo slow ;D |
|
|
|
Post by mk1morris on Nov 19, 2009 14:58:48 GMT
lol no i havent just slapped it on and ragged it i took a lot of time with coulour tune and timing gun etc setting it up obviouse its not 100% correct or as good as gerald will do it but for time being its ok  |
|
|
|
Post by Simon1275mpi on Nov 19, 2009 15:06:31 GMT
I know you wouldn't. Did you check the needle was correct for a 1275 MG though? BDL was the standard fit from memory.
|
|
|
|
Post by mk1morris on Nov 19, 2009 15:08:29 GMT
so my diff is not the best for a equal ballance (more expence)  anyone no of a good devouse laywer ;D |
|
|
|
Post by Stephen on Nov 19, 2009 15:35:24 GMT
3.44 is to low geared for me
|
|
|
|
Post by MiniGT5 on Nov 19, 2009 16:59:30 GMT
I thought I had a 3.44 dif in the pickup - Si can you remember Anyway that was topping out at 95 - 100 mph on geralds rollers the other day. N |
|
|
|
Post by MiniGT5 on Nov 19, 2009 17:00:43 GMT
3.44 is to low geared for me Too Slow What you running in your new engine |
|
|
|
Post by Miniböttcher on Nov 19, 2009 17:28:54 GMT
oh no i see the good old diff banter about to start
i going for a 3.1 good all round diff ratio,
getting out of hear before it get dangerours
|
|
tut tut. Wait till Gerald tinkers with the needle and timing 
anyone no of a good devouse laywer ;D
