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Old 08-26-2002, 10:19 PM
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Question camshaft replacement, HP increase?

I have a 78 300d. A "tech tip" I was told of said that if I put in a 81 or newer camshaft, the horse power should go up about 5HP! anything to this "tech tip"???
different grind in the turbo cams? vs. non-turbo, older grinds?

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Old 08-27-2002, 08:56 AM
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Changing the camshaft by itself will have no effect on power output. A diesel engines power is determined strictly by the amount of fuel that is injected into the cylinder. If you want more power, I suggest that you buy another car or maybe transplant a turbo five cylinder into yours. If you did manage to increase fuel flow the proper amount for the added flow of the camshaft, the increase in power would be negligible.

Unlike a gas engine increasing air flow allows you to safely inject more fuel to make more power. In a gas engine the fuel and air are mixed when they enter the cylinder, thus increased airflow means that fuel flow is also increased in one way or another for the engine to run properly.

Have a great day,
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Old 08-27-2002, 02:32 PM
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Join Date: Jun 2001
Location: San Diego, Ca
Posts: 186
I'm curious, assuming this would indeed alow more air, why would it not alow more power? With more air, you could then increase the fuel delivery accordingly and that increase in fuel/air should yield more power. Now weather it's enough to make it worth the work is another story.

I'd lean towards swapping the turbo 5 in there. The power difference between my normally aspirated 79 300D and the '82 Turbo SD is quite large. The SD even being a larger car is much faster.

'82 300SD
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Old 08-27-2002, 03:19 PM
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Yes, that's the point, it would allow to SLIGHTLY increase the fuel into the cylinder, thereby increasing power. How are you going to accomplish this increase and how much do you increase it. After your done, if it's done right, the increase will probably not be at all noticable.

My $0.02,
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Old 08-27-2002, 09:59 PM
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Unhappy re-read my Question......

My Question had to do with cam grinds, not fuel delivery, or going to a turbo setup..
is there a difference in cam timing of the ground cam lobes from old to a new ? might check if they are the same part no.
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Old 08-27-2002, 11:16 PM
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Join Date: Jan 2000
Location: PA
Posts: 5,440

Its not worth the time, trouble or expense changing your camshaft. Power difference will be minimal.

If you really neet more power, go for a turbo engine. It will have power you can feel, especially at higher altitudes.

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Old 08-28-2002, 08:16 AM
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P.E. is exactly right. If there is a difference in cam grinds it is microscopic.

Have a great day,

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