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Old 10-09-2010, 12:00 PM
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roller cams and timein gears r chaines

i have a 350 88block with 69 heades its got rollercam i dont know what size cam its got hr-284-25 12ig 10-20-01 engaved on it with pete jackson gear it on an airboat ? is i was gettin no more than 2500 rpm with prop on took timein cover off it was avanced like 25 r 27 deg put it back right still gettin 2500 rpms is cam wrong

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Old 10-09-2010, 05:04 PM
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Your post has me confused, are you referring to spark timing or cam timing? The cam timing being 27 degrees if it was that far off I don`t think the engine would even run. Need more detail on what your referring to.
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Old 10-09-2010, 05:32 PM
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cam timeing

the mark on the crank was pointing at the #1 and the cam mark was at the fuel pump i have put 3 dif carbs on and it still dose more than 2500 rpms if i take the prop off it has no prob doin 6000 rpms is can to big
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Old 10-09-2010, 06:13 PM
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What mark on the crank? The timing mark on the damper?

What do you mean by "the cam mark was at the fuel pump..."??

Are you talking about the timing dots on the cam and crank gear? If so, these positions are with the #1 piston at TDC on the compression stroke?

Did you change the cam or timing gear recently? I mean, what have you done to make this like it is? You need to line up the dots on the cam and crank. Do a search for cam timing.

How to verify crank and cam markings?
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Old 10-09-2010, 06:25 PM
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the dot on the crank gear the cam gear dot is was that way when i got the motor it wasnt gettin but 2500 rpms so i got a rv cam when i took motor apart the dots where off so put the crank dot at 12 and cam dot at 6 oclock still doin 2500 rpms
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Old 10-09-2010, 06:47 PM
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And you're sure the #1 piston was at TDC on the compression stroke?
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Old 10-09-2010, 07:12 PM
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You mean it idles at 2500 RPM?
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Old 10-09-2010, 07:13 PM
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iam not sure if it was was not home when it was stared how do know for sure i had the #1 on top but but it mite not of been on the comp stroke will that mess up the rpms
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Old 10-09-2010, 07:18 PM
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If you mean it idles at 2500 RPM you either have a carb or a spark timing problem, cam timing won`t make it idle that high.
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Old 10-09-2010, 07:37 PM
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no it dose not idle at 2500 rpm it wont get no higher than 2500 rpms it idles at 500 rpm
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Old 10-09-2010, 08:06 PM
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can the cam make it not get up past 2500 rpms can it be to big of a cam i think it is a comp but i dont know how to tell i think it is a costm grind it has # engraved on the front where the timein gear goes
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Old 10-09-2010, 09:24 PM
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You need to go from square one. Make sure the cam is installed correctly, adjust the valves correctly, get the #1 piston at TDC on the compression stroke, set the distributor with the rotor at #1 when the #1 piston is at TDC and start it, then set the timing.

Some of the things you say here are bizaar and make no sense. It'll rev to 6k without the prop on and only 2,500 with the prop? What's with that?
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Old 10-10-2010, 09:32 AM
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i know thats y i think the cam is to much cuz i tryed to props 1 was a pich prop still did the same the other a woodin prop did a little better at plainin out but still whould not get over 2500rpm
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