300-400 rpm diffrence between engines
+ Reply to Thread
Results 1 to 8 of 8

Thread:
300-400 rpm diffrence between engines

  1. #1
    Senior Member glastornjet73's Avatar
    Join Date
    Oct 2009
    Posts
    657

    Default 300-400 rpm diffrence between engines

    A friend of mine has a emilinator daytona 30 with 2 teague 750's and one is clearly missing under a load and turns 3-400 rpm less he has just tuned up both engines new coils valves have been ran and are set to spec timing is locked and 32 and stable on both engines compression verys no more than 5 pounds between and two cylindes on both engine s ignition boxes and soft touches have been switched side to side i told him to check jetting in the carbs and maybe degree the cams fairly easy task he has jesel open belt drives any other ideas?

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member Futs's Avatar
    Join Date
    Dec 2007
    Location
    Orange CA, Big River
    Posts
    4,549

    Default

    Check the valve springs for a broken inner or outer. then check the spring pressures.

  4. #3
    Senior Member glastornjet73's Avatar
    Join Date
    Oct 2009
    Posts
    657

    Default

    Good call ill have him check for broken inners hes pretty sharp he would have caught broken outers and ill have him check pressures

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member SoldHondaBoughtHondo's Avatar
    Join Date
    Oct 2009
    Location
    Lake Havasu az.
    Posts
    4,318

    Default

    Missing under load? worse with more rpm? Do any of the plugs look even slightly different?
    "A liberal paradise would be a place where everybody has
    guaranteed employment, free comprehensive healthcare, free
    education, free food, free housing, free clothing, free
    utilities, and only law enforcement has guns. And believe it or
    not, such a place does, indeed, exist: It's called prison."

    Sheriff Joe Arpaio
    Maricopa County Sheriff's Office

  7. #5
    Senior Member glastornjet73's Avatar
    Join Date
    Oct 2009
    Posts
    657

    Default

    Not from what i could tell but the guy sunk the boat last time he had it in the water and all the plugs were water fouled when i had em out but the problem was from before he sunk it i pulled and the plugs oiled the cylinders and gut both engines fired back up before they could sit and rust this was all at 1:00 am the puckup tube for the theough hulk came off and it sunk he put new plugs dried out everything serviced everything and new he is working on his misfiring again lol

  8. #6
    Senior Member SoldHondaBoughtHondo's Avatar
    Join Date
    Oct 2009
    Location
    Lake Havasu az.
    Posts
    4,318

    Default

    Valve springs, maybe but that would be a ways down the list unless it had a backfire issue, especially on a Teague motor
    Swap the plugs/wires? dizzy cap? Maybe a piece of dirt/water in carb?
    If you can get it to do it on the trailer it would help. Do you have infrared thermometer?Look for a colder exhaust pipe....I would say do a cylinder drop test...pull plug wire off at the plug, one at a time....at your own risk...any of the ignitions used now scare the hell out of me.

    One good thing, it's got good compression, the repair should be cheap, it's just a matter of finding the problem.
    "A liberal paradise would be a place where everybody has
    guaranteed employment, free comprehensive healthcare, free
    education, free food, free housing, free clothing, free
    utilities, and only law enforcement has guns. And believe it or
    not, such a place does, indeed, exist: It's called prison."

    Sheriff Joe Arpaio
    Maricopa County Sheriff's Office

  9. #7
    Senior Member glastornjet73's Avatar
    Join Date
    Oct 2009
    Posts
    657

    Default

    Cap rotor and wires are new on both engines and problem still existed switched boxed dizzys and coils problem still stayed with the port engine i told him to check jetting in the carb but he decided to swap carbs instead and you cant check temps on the header tubes it has jacketed stellings headers

  10. #8
    Senior Member bp298's Avatar
    Join Date
    Dec 2007
    Location
    LHC
    Posts
    6,570

    Default

    Quote Originally Posted by glastornjet73 View Post
    Cap rotor and wires are new on both engines and problem still existed switched boxed dizzys and coils problem still stayed with the port engine i told him to check jetting in the carb but he decided to swap carbs instead and you cant check temps on the header tubes it has jacketed stellings headers
    ok. I feel the strong need to tell a story. 3 weeks ago, I went to Dexter Oregon for the CDBA/Lucas race there. towed 1100 miles. on Friday, decided to test and tune. stan tweedy gave me a hand, since my crew wouldn't get there until Friday night and he wasn't testing.
    made the first run, didn't feel terrible and didn't hear anything really odd. 9.52. shocked. checked data, I was down almost 400 rpm. started checking everything. plugs were new at Irvine, looked fine. decided to change the cap/rotor just because. checked springs, checked pump, could find nothing. went back out, went slower. 9.63. rpm is still down 400. check everything again. we think, maybe a compression check, but there's nothing odd with exhaust. engine still doesn't sound -bad-, sounds fine on trailer. stan suggests maybe changing plugs. these are new, but what the hell. pull out fresh set, gap and install. running out of time to get in lanes.
    so I get all my junk on and we head to lanes. i'm thinking of making phone calls to tell people not to bother coming. sitting on the trail to the lanes, a head appears just below my vision with the helmet. awesome toy owner, and resp chaplain dan saying hi. he can tell i'm not terribly happy.. "what's wrong?" down 400 rpm. so he says "well, lets pray for your 400 rpm", so he does.
    I drive out to the rope, no idea what to expect. still thinking about phone calls. number comes up, I do a dumbass wheelstand launch, just stay in it 'cuz i'm a bit mad. boat settles in and starts trucking down track. I glance down at the tach, rpm is now good. we can now compete..
    after getting back to the pit and getting things organized, I go down to dan's pit and let him know I now have my 400 rpm back. "you WILL be coming to chapel sunday morning. that's the deal"... so of course I went.

    those plugs were brand new. had 4 laps on 'em. some way some how, one or more of 'em wasn't up to the task. same plugs I've been running. so. I would suggest changing plugs. and maybe a prayer (can't hurt).

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Digg This Thread

Posting Permissions

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95