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holden v8 wont rev hard...

Started by _@milco@_ , Jun 25 2007 09:34 PM

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#1 _@milco@_

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Posted 25 June 2007 - 09:34 PM

hi
i am having a problemwith my 253 where it will not rev over 4 grand, the motor has been completely rebuilt, has a mild cam, Yella Terra spec heads just machined up and put on, holden 4 barrel manifold, brand new rebuilt quaddie
all these things are garrented

my only issue is that i got a "rebuilt trimatic" well thats what the guy told me ( sort of mate trust worthy tho) the trimatic shifts fine and does not seem to slip, i was just wondering what would be a possible factor in it not reving...

i was thinking stall converter might be a issue, is it possible?

the trimatic appered to be in very good nick as i was told fluid was nice red color not burnt. the car will chirp shifting from first to second no problems.

car is running a 3.36 diff could this be the issue?

this is my first auto torrie the rest have been manual, ( i am kinda kicking my self now should have gone manual.....)

help!

#2 mr5000

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Posted 25 June 2007 - 09:47 PM

dont no i nearly bought a very clean wb ute with caprice interior and all the goodies took it for a test drive wouldnt rev over 3500 so i steered clear of it

#3 _rorym_

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Posted 25 June 2007 - 09:53 PM

diff wont stop it from revving...look elsewhere.
R

#4 _@milco@_

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Posted 25 June 2007 - 10:13 PM

diff wont stop it from revving...look elsewhere.
R

yeah thought so, just had a slight thought that it might be a gearing issue.... ok so nit the diff....

i have had two electronic dissy in the car same thing both cam out off fine cars perfect working order, so i doubt it's spark.

mm what else, i am leaning towards a gearbox/convertor issue but i dont know much about it at all, and i dont want to fork out the cash to get the convertor replaced and then have the same issue, just thought somone on here might be a bit more cluey about trimatic set ups...

#5 surfmaster

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Posted 25 June 2007 - 10:20 PM

Does it rev over 4k in Park/Neutral - start with basics and eliminate things. For a motor to work properly everything has to be installed and adjusted correctly. This means camshaft, ignition timing, fuel supply/flow (blocked fuel filiter??), blocked or restricted exhaust, secondarys not opening, float level too low. Just a few items to check?

#6 _@milco@_

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Posted 25 June 2007 - 10:38 PM

ok
timing is about 11-12deg adv,
brand new fuel pump
brand new fuel filter
genie extractors, new 2 1/2 inche twin pipe system with cross over pipe

dont know how to check float level of a quaddie

( quaddie was complete ly rebuilt buy a carby shop in melb, he also and tuned it as well)

i think it is getting a bit to much fuel and it's running slightly rich....

new leads
new plugs...

i am a bit suspect on the tune



also it's a fresh motor just been rebuilt, i have only put about 500-700km on if that............

#7 _Squarepants_

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Posted 25 June 2007 - 10:39 PM

Check the operation of the mechanical advance in the dizzy. I know a dude who had a similar problem, turned out his dizzy shaft was seizing up.

#8 _@milco@_

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Posted 25 June 2007 - 10:48 PM

Check the operation of the mechanical advance in the dizzy. I know a dude who had a similar problem, turned out his dizzy shaft was seizing up.

mmmmm never thought of that....... might have to do that..... thanks

#9 _Jewboy_

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Posted 25 June 2007 - 11:37 PM

Is it breaking down over 4K when revved hard but revs over that if done slowly? mine did that because it wasn't getting proper 12v at the coil, the coil had been setup as if it had a points dissy (pink wire) and not the HEI

#10 _JBM_

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Posted 25 June 2007 - 11:43 PM

Is the balancer new? If the outer has parted company your timing could be anywhere.

Check the static timing on No 1 cylinder.

James

#11 rodomo

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Posted 26 June 2007 - 12:35 AM

What actually happens at 4000rpm? Misfire? Backfire? Brief deceleration?

#12 _@milco@_

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Posted 26 June 2007 - 08:13 AM

i have done the 12v mod, to the dizzy so it is getting the full 12v,

at 4grand it just will not rev anymore... does not missfire or backfire at all

#13 _mumbo_

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Posted 26 June 2007 - 08:47 AM

Valve springs?

#14 Struggler

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Posted 26 June 2007 - 09:04 AM

Valve springs?

x2

#15 TerrA LX

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Posted 26 June 2007 - 09:32 AM

Who

completely rebuilt

the motor?
Id be looking at spring and cam timing.

#16 _@milco@_

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Posted 26 June 2007 - 10:43 AM

mmmm i got a short motor built up, and then got the heads worked else where, gave all the specs of the motor/cam combo to the place that did the head, mmmm how do i check if the springs are right/wrong?

#17 TerrA LX

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Posted 26 June 2007 - 10:50 AM

Who done the final assembly.
If the springs are that soft you would probably be able to compress them with your hands.
Dont forget to start with the easy things like dizzy and coil.

#18 _@milco@_

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Posted 26 June 2007 - 11:29 AM

i did the final assembly, basically put the heads and manifold and all other stuff on,

i have checked all the easys stuff , thats why i am asking you blokes!
thanks so much guys any more ideas are welcome.

i will check the valve springs and go from there....

#19 _dave720gtr_

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Posted 26 June 2007 - 01:10 PM

this reminds me of a story a freind was telling,, back in70 his mate owned a car yard and traded a brand new v6 ford capri well 4month old the guy who owned it was over it because ford wouldnt or couldnt fix it. thay replaced every thing"
it had them stuffed :furious: this would not rev ofer 4000rpm he had it at every ford dealer in tasi and thay couldnt fix it ?
Well my friend was the mecanic for this guy who traded it and he stuffed around with it for a some time before thay put in up on the host and my mate grabed the gass axe and chopped the pipes off :tease:
it went straight too 7000rpm had a blocked muffler from factory :cry: stuped ford

Edited by dave720gtr, 26 June 2007 - 01:13 PM.

#20 TerrA LX

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Posted 28 June 2007 - 10:47 PM

^ a simple check with a vacuum guage would tell you that along with timing and weak valve springs, a mechanic without one is as useless as tits on a bull.

http://www.gmh-toran...showtopic=15006

look at senario 9, 10, 11 and 14 for an idea.

Edited by ALX76, 28 June 2007 - 10:50 PM.

#21 YiriSS

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Posted 28 June 2007 - 11:34 PM

hey milco

for f*cks sake, your around the corner from danny, let him have a look at it,

just remember to tell him i sent you

mick

Edited by YiriSS, 28 June 2007 - 11:35 PM.

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