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Topic Review (Newest First)

  • 06-09-2009, 22:35
    kapri
    Went up to the do at the Wingspan club today and they were doing cheap power runs on a local dyno. Eventually got on there ...mmmmm....not what I was expecting.

    The last line of mods was to dial the cam in correctly with a vernier pulley and dial gauge ,ended up 6 degrees advanced from previous position , and to put on a known good DGAS from the POS. Felt a lot torquier out on the road though the long run today showed up surging at 3000-3500 in top.


    Now ...the power run. Performed in second gear ( almost normal 3rd auto due to the tall gearing) and it made 76bhp at 5803 compared to best previously of 80.2 at 3250 ( in third).

    Torque DROPPED from a best of 120lbs @ 2200 but falling away to 60lbs at 4000 to a best reading of 87lbs @ 2400 to 76 @ 4000.

    Running way rich on the machine,no printout ( 23mpg on the run) , hence the surging ..though the carb ran fine on the POS.

    I thought advancing the cam ( beyond correct timing) was meant to bring in more torque earlier yet I had more torque earler ,but falling rapidly ,with timing 6 degrees retarded from 'correct' cam timing .

    WTF is happening ? Seems the more I fix the worse it gets ??
    __________________
  • 03-09-2009, 00:11
    chaley
    Kev, when I ran the pinto in Tetanus I could only use fifth on the motorway over at 70mph and if I knew that I wouldn't want to put my foot down, it would pull around the 90mph in fifth and around 95mph in fourth. I changed from the 3.7 diff to a 4.1 and it changed the car sooooo much, I could use all the gears as I should and MPG went way up, plus in the end I saw 115mph on the sat nav (on a private test track officer) I'm lead to believe that the axle was from a 1300cc 2 door mk 3, sadly it let go in a big way on the first run out with the rover (the traditional out of the garage straight to big burnout wasn't such a good idea:****er
    I know that doesn't help much, but stick some 13's on the truck and it'll tell the tale.
    Chaley
  • 02-09-2009, 08:29
    kapri
    110 ...so about a true 100 at 18mph/1000 = 5500rpm?
  • 01-09-2009, 23:57
    Hemi Bucket
    Mk3 GT when it was a fairly new car would show just short of 110 on the clock, had a Mk3 that had a stock 2.0 engine, 1600 box & axle, ran low 17s all day long, by no means Earth shattering but deadly consistant.
  • 01-09-2009, 21:32
    kapri
    Quote Originally Posted by Hemi Bucket View Post
    No different on the last test thrash then Kev? I was thinking on the way home, when you say it's got 3.89:1 gears, have you counted the ring & pinion or are you going by what the axle's supposed to be from?

    Literally just walked in from looking underneath as I was thinking along similar lines. B type axle ,2000 car only which makes it a 3.7. According to Haynes A type axle 3.89 fitted to 1600 and 4.1 option on 1600 saloons and estates.

    Definitely pulling stronger but not reving past 4000 in top which is a true 80mph against satnav.

    You've had loads, what woudl a Cortina 3/4/5 saloon top out at ...100 or so on the clock ?
  • 01-09-2009, 20:47
    Hemi Bucket
    No different on the last test thrash then Kev? I was thinking on the way home, when you say it's got 3.89:1 gears, have you counted the ring & pinion or are you going by what the axle's supposed to be from?
  • 01-09-2009, 19:59
    kapri
    It took a little longer than expected

    Matt ( Deucetudor) turned up with lots of gauges so we could check everything over . After a lot of playing it still wouldn't idle or atomise fuel properly. Al ( Hemi Bucket) also turned up and we decided to rob the DGAS from the POS. Mark Bull and Nick New also turned up to cover ****taking duties whilst bits were swapped over.

    Took it for a drive and torque is definitely up ,lifting the front far more and when letting speed drop in top it will surge forward when accelerating rather than slowly gather speed.

    I also took our 135bhp (92kw) DOHC Sapph for a run to compare acceleration characterics as they are of very similar weights .It does look like the gearing ( as suggested by many ) is playing a large part in the brickwall effect as 1st gear on the A is almost 2nd gear on the Sapph > hence by the time I'm in top in the A that's almost equivalent to overdrive top on the 4 speed auto .

    Guess the only way to be certain of that is to fit smaller rims as suggested by some to see the change.


    Cheers to everone that gave a hand today
  • 01-09-2009, 18:22
    56 AUSTIN
    Going to take me about an hour to get it all back together afterwards..fingers crossed.


    kev, were all waiting with baited breath here, whats the verdict m8 ?.........
  • 01-09-2009, 11:52
    kapri
    Cheers Richard I've just walked in to give my back a chance after setting the cam timing. I'm paranoid and have checked and rechecked 4 times now

    Going to take me about an hour to get it all back together afterwards..fingers crossed.
  • 01-09-2009, 10:47
    rodbuilder
    I have a really good carb you can borrow if you need it, can courier it up tomorrow as long as you let me know today.

    Rich
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