User Tag List

+ Reply to Thread
Page 2 of 2 FirstFirst 1 2
Results 41 to 65 of 65

Thread: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

  1. #41
    Spanner Monkey

    Join Date
    Dec 2011
    Location
    Cowdenbeath
    Age
    40
    Posts
    400
    Thanks
    32
    Thanked 17 Times in 16 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Yes the weight of the pistons and the constant revs mean it stretches the rods then they snap lol

  2. #42
    Mechanic Nelly's Avatar
    My Race Car
    Join Date
    Oct 2007
    Location
    eastbourne
    Posts
    726
    Thanks
    10
    Thanked 27 Times in 27 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    As mentioned, oval engines have to use standard crank, rods and pistons and regularly see 8000+ rpm on 11-1 compression. Although this is only for a brief spell at the end of each straight, its twice every lap for up to 50 laps and often in nose to tail traffic. People do have failures but not that often and its never crank, very occasionally rods and the most common thing is to crack the ring land on number 4 piston.

    I think they're strength is often underrated and id happily pull 8000rpm on a track day.

  3. #43
    Tyre Kicker

    Join Date
    Jun 2019
    Location
    Newzealand
    Age
    48
    Posts
    33
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Hi . Im using forged H beam Maxspeedingrods and Mahle cast pistons with thinner top compression ring , also running around10.9 to 1 comp.At the moment i rev it to 7krpm and have rev limiter set at 7500rpm. I want to upgrade my camshaft to something equivalent of RL31 and maybe set rev limiter to 8krpm . Do you think this would be ok?

  4. #44
    TURBOSPORT SPONSOR Turbosport Subscriber
    Turbosport Moderator
    Turbosport Administrator
    Graham's Avatar
    My Race Car
    My 1st Project
    Join Date
    Feb 2006
    Location
    Ely, Cambs
    Age
    56
    Posts
    25,110
    Thanks
    310
    Thanked 2,476 Times in 2,250 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Quote Originally Posted by Nelly View Post
    As mentioned, oval engines have to use standard crank, rods and pistons and regularly see 8000+ rpm on 11-1 compression. Although this is only for a brief spell at the end of each straight, its twice every lap for up to 50 laps and often in nose to tail traffic. People do have failures but not that often and its never crank, very occasionally rods and the most common thing is to crack the ring land on number 4 piston.

    I think they're strength is often underrated and id happily pull 8000rpm on a track day.
    on the ovals do they just lift a bit at the end of the straights or snap the throttle shut?

  5. #45
    TURBOSPORT SPONSOR Turbosport Subscriber
    Turbosport Moderator
    Turbosport Administrator
    Graham's Avatar
    My Race Car
    My 1st Project
    Join Date
    Feb 2006
    Location
    Ely, Cambs
    Age
    56
    Posts
    25,110
    Thanks
    310
    Thanked 2,476 Times in 2,250 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Quote Originally Posted by Bakerk View Post
    Hi . Im using forged H beam Maxspeedingrods and Mahle cast pistons with thinner top compression ring , also running around10.9 to 1 comp.At the moment i rev it to 7krpm and have rev limiter set at 7500rpm. I want to upgrade my camshaft to something equivalent of RL31 and maybe set rev limiter to 8krpm . Do you think this would be ok?
    depends on how your luck runs! i cant see any point in trying to rev to 8K on an RL31, it wont make power that high up the rev range

  6. #46
    Tyre Kicker

    Join Date
    Jun 2019
    Location
    Newzealand
    Age
    48
    Posts
    33
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    So maybe a few hundred rpm after peak power? I understand pinto heads dont flow beyond 7500rpm . Even now mine peaks at 6300rpm but i usually shift at 7000rpm . Have hit the rev limiter at 7500 a couple of times in first gear. Unlike twin cams my engine still make reasonable power after the peak. 153hp at 6300rpm and still 140+ at 7000rpm .

  7. #47
    TURBOSPORT SPONSOR Turbosport Subscriber
    Turbosport Moderator
    Turbosport Administrator
    Graham's Avatar
    My Race Car
    My 1st Project
    Join Date
    Feb 2006
    Location
    Ely, Cambs
    Age
    56
    Posts
    25,110
    Thanks
    310
    Thanked 2,476 Times in 2,250 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    air flow through the head doesn't really relate to rpm as such, it will limit how far the engine wants to rev, and the smaller the engine the higher ( cam and everything else allowing) it will want to rev, hillman imp heads dont flow much air, but on a 998cc bottom end the engines can and will rev to 10,000 rpm.

    if your engine peaks at 6300 rpm, unless it falls off cam because your gear ratios are to wide, your probably going slower by revving it to 7000 than changing up @ 6500

  8. The Following User Says Thank You to Graham For This Useful Post:


  9. #48
    Tyre Kicker

    Join Date
    Jun 2019
    Location
    Newzealand
    Age
    48
    Posts
    33
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    With type 9 gearbox a shift at 7000 in first drops back to 3778 in second or back to around 85hp . Shift at 6500 drop back to 3508 or 70hp . All other gears are much more closely spaced . Taking it to 7000 in second is 99km/hr which is convenient ��.

  10. #49
    TURBOSPORT SPONSOR Turbosport Subscriber
    Turbosport Moderator
    Turbosport Administrator
    Graham's Avatar
    My Race Car
    My 1st Project
    Join Date
    Feb 2006
    Location
    Ely, Cambs
    Age
    56
    Posts
    25,110
    Thanks
    310
    Thanked 2,476 Times in 2,250 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    your going to be better off fitting a gear kit to your gearbox than changing the cam and revving the engine harder

  11. #50
    Racer Decade Plus User

    Join Date
    May 2012
    Location
    Camberley, Surrey
    Posts
    3,237
    Thanks
    5
    Thanked 353 Times in 339 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Or lower the axle ratio and forget about using 1st (its a damn caravan gear in my opinion!)

  12. #51
    Tyre Kicker

    Join Date
    Jun 2019
    Location
    Newzealand
    Age
    48
    Posts
    33
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Lol yeah 3.65 is pretty low with a 3.9 diff hence hitting the rev limiter a couple of times. Guess ill play with my shift light and a stopwatch and see.

  13. #52
    Mechanic snapper1's Avatar

    Join Date
    Oct 2010
    Location
    Chelmsford
    Age
    67
    Posts
    668
    Thanks
    27
    Thanked 50 Times in 48 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    V6 gearbox makes a little bit useful difference, I’m looking to put a 2.7 first in mine.
    Yes I know the input shaft is longer so I used a 30mm spacer between box and bellhousing, bit of fiddling with gearbox and engine position but works well

  14. #53
    Pole Position Decade Plus User
    Turbosport Administrator
    Miniliteman's Avatar

    Join Date
    Feb 2004
    Location
    the Netherlands
    Posts
    4,888
    Thanks
    38
    Thanked 611 Times in 558 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Quote Originally Posted by Bakerk View Post
    Hi . Im using forged H beam Maxspeedingrods and Mahle cast pistons with thinner top compression ring , also running around10.9 to 1 comp.At the moment i rev it to 7krpm and have rev limiter set at 7500rpm. I want to upgrade my camshaft to something equivalent of RL31 and maybe set rev limiter to 8krpm . Do you think this would be ok?
    What cam do you have now?

  15. #54
    Tyre Kicker

    Join Date
    Jun 2019
    Location
    Newzealand
    Age
    48
    Posts
    33
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Crow 26661 290 0.448

  16. #55
    Spanner Monkey

    Join Date
    Dec 2011
    Location
    Cowdenbeath
    Age
    40
    Posts
    400
    Thanks
    32
    Thanked 17 Times in 16 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Quote Originally Posted by Graham View Post
    on the ovals do they just lift a bit at the end of the straights or snap the throttle shut?
    We lift of completely Graham,typically in a 2.0 hot rod we are geared to rev from 7800 to around 8200 sometimes more and its very uncommon to see any failures. These engines use a standard crank gods and cast Pistons

  17. #56
    Mechanic hawk1903's Avatar
    My Race Car
    Join Date
    Jun 2009
    Location
    istanbul
    Age
    56
    Posts
    956
    Thanks
    269
    Thanked 59 Times in 59 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Quote Originally Posted by Bakerk View Post
    With type 9 gearbox a shift at 7000 in first drops back to 3778 in second or back to around 85hp . Shift at 6500 drop back to 3508 or 70hp . All other gears are much more closely spaced . Taking it to 7000 in second is 99km/hr which is convenient ��.
    As Graham wisely suggested a gear kit could be nice, even the 1.gear ratio change makes the type 9 box very sweet. You can buy only the 1.gear ratio change.

  18. #57
    Tyre Kicker

    Join Date
    Jun 2019
    Location
    Newzealand
    Age
    48
    Posts
    33
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Ok cool i didn't know you can change just first gear in the type9 . Ill definitely look into that .

  19. #58
    TURBOSPORT SPONSOR Turbosport Subscriber
    Turbosport Moderator
    Turbosport Administrator
    Graham's Avatar
    My Race Car
    My 1st Project
    Join Date
    Feb 2006
    Location
    Ely, Cambs
    Age
    56
    Posts
    25,110
    Thanks
    310
    Thanked 2,476 Times in 2,250 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    you have to by a modifed gear kit to do it though, but its obviously cheaper then a proper gearkit

  20. #59
    Mechanic Nelly's Avatar
    My Race Car
    Join Date
    Oct 2007
    Location
    eastbourne
    Posts
    726
    Thanks
    10
    Thanked 27 Times in 27 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Quote Originally Posted by Graham View Post
    on the ovals do they just lift a bit at the end of the straights or snap the throttle shut?
    Off the throttle and onto the brake as quick as possible. Any delay is lost laptime and probably a "nudge" from the car on your back bumper lol.

  21. #60
    Mechanic snapper1's Avatar

    Join Date
    Oct 2010
    Location
    Chelmsford
    Age
    67
    Posts
    668
    Thanks
    27
    Thanked 50 Times in 48 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Use a V6 box as your base, it’s got better ratios all round, add a long first and it pretty good. Most oval racers will have very close 2nd & 3rd changing diffs for the circuit.
    Nay be 3rd 4th are close (200rpm), I’ll try and find the ratios they use, no good for the road though

  22. #61
    Racer Decade Plus User

    Join Date
    Mar 2010
    Location
    Edinburgh
    Age
    46
    Posts
    3,641
    Thanks
    68
    Thanked 234 Times in 230 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    snapping off the throttle at full revs puts an engine under the worst stress, its where most rods fail. Heavy compressive forces suddenly stop as engine pulls a vacuum.

  23. #62
    Tyre Kicker
    My Race Car
    Join Date
    Sep 2018
    Location
    Australia
    Age
    48
    Posts
    28
    Thanks
    1
    Thanked 7 Times in 5 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Quote Originally Posted by Bakerk View Post
    Crow 26661 290 0.448

    That Camshaft is horrid, much better off with something better, it will make more power everywhere, even with smaller specs in certain areas & the same rpm band.
    Last edited by wozzah1975; 23-07-2020 at 06:58.
    WARREN HEATH PERFORMANCE
    https://www.facebook.com/Warren-Heath-Performance-135194779879292/

  24. #63
    Spanner Monkey

    Join Date
    Jun 2015
    Location
    Australia
    Age
    50
    Posts
    293
    Thanks
    8
    Thanked 10 Times in 10 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Hi Warren what's a good off the shelf cam to buy here in Australia cheers mario

  25. #64
    Tyre Kicker
    My Race Car
    Join Date
    Sep 2018
    Location
    Australia
    Age
    48
    Posts
    28
    Thanks
    1
    Thanked 7 Times in 5 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Quote Originally Posted by mariors2000 View Post
    Hi Warren what's a good off the shelf cam to buy here in Australia cheers mario
    Clive & Tighe both offer decent grinds to suit multiple applications, and Camtech offer a some grinds which work pretty well.

    I've never seen anything made by Crow for a Pinto (or a lot of other 4 cylinder engines for that matter) work as it should. When you start checking the lobes on the cam dr on that 26661 grind you start to realise why its so doughy, it's seriously one of the worst cams for a Pinto I've seen on offer.
    WARREN HEATH PERFORMANCE
    https://www.facebook.com/Warren-Heath-Performance-135194779879292/

  26. #65
    Tyre Kicker

    Join Date
    Jun 2019
    Location
    Newzealand
    Age
    48
    Posts
    33
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: building a pinto 2.0 or 2.1 with bvh and cam advice please ?

    Good to know . im making 155hp and 192nm with the 26661 so hopefully with a cam swap and remap ill get a bit more.

+ Reply to Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts