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Old 04-07-2008, 03:43 PM   #1
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Default Nitro motor timing questions?

I ran quite a few different motors and read a few discussions on modders and timing. I just thought I would start a thread to ask general questions about timing. I know Maximo has stated most modders don't touch timing and with the modded motors I've taken apart I've never seen any timing changes. I've seen so many different port shapes with different motors I was just curios what makes it a top end motor or bottom end motor.

More crank timing (wider gap on crank) increases top end?

Moving sleeve ports up toward head also helps top end? I've heard of some using a shim under the sleeve to move the ports up.

Rex
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Old 04-09-2008, 09:23 PM   #2
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Anyone?

Rex
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Old 04-09-2008, 10:22 PM   #3
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i always hear maximo stating that he changes the timing on his engines , the only real way to do this is to run an on road crank that has advanced crank timing which makes for a very odd powerband in offroad applications (tried it
). changing angles of port intakes doesn't do anything for timing but can smooth out the engine and make for an explosive top end and you usually can gain minor fuel mileage extension as you need less input to create a little extra power. ceramic bearings are a greater improvement than most people realize in that they do not assume harmonic vibrations that hinder rotation thus gaining efficiency , runtime, longer bearing life, a more balanced rotation of the engine and way more top end , amyway i could go on for pages but goodnight .
monty
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Old 04-10-2008, 08:23 PM   #4
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You can change timing on a crank by grinding the opening on one or both sides. A Go 3 port race spec has the tallest exhaust port I've seen, I am just trying to understand what these changes do.

Rex
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Old 04-10-2008, 08:29 PM   #5
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jp does this mod to their cranks , their cranks are good . it works
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Old 04-10-2008, 09:18 PM   #6
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Rex, if your looking to change crank induction, use the case. Tranfers and boost, i think you have a good understanding on that.
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Old 04-10-2008, 09:20 PM   #7
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I re-grind my sleeve ports to alter timing...As well as alter crank window opening.

Also adjusting ramp angles not having much effect, well i guess it depends if your referring to the top or bottom of the port.. the angle at the top of the port is much more critical then the angle on the bottom of the port.

On my motors I regrind the timing/shape and entry angles of my ports...very tedious and time consuming to say the least...but the results are well worth the efforts IMHO
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Old 04-10-2008, 09:28 PM   #8
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Rex, if you want some opinions out side of the box, grab a crobar, and try prying into Uriah Murnans mind of Murnan Modifieds, he has the most bad ass onroad engines i have ever seen live on the track, the way they sound reminds me of a Formula 1 Ferrari at the end of a long strait, it's wicked
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Old 04-10-2008, 10:08 PM   #9
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Quote:
Originally Posted by 22Racer View Post
I ran quite a few different motors and read a few discussions on modders and timing. I just thought I would start a thread to ask general questions about timing. I know Maximo has stated most modders don't touch timing and with the modded motors I've taken apart I've never seen any timing changes. I've seen so many different port shapes with different motors I was just curios what makes it a top end motor or bottom end motor.

More crank timing (wider gap on crank) increases top end?

Moving sleeve ports up toward head also helps top end? I've heard of some using a shim under the sleeve to move the ports up.

Rex

Some modders will alter the crank induction timing..very few will alter the sleeve timing....
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Old 04-11-2008, 10:43 AM   #10
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Maximo can you post some timing specs for an example engine.

sounds cool
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