"help" McCulloch Mac 2181 (PRO MAC) "28cc"  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Gas Engines >> "help" McCulloch Mac 2181 (PRO MAC) "28cc"
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"help" McCulloch Mac 2181 (PRO MAC) "28c... - 7/6/2006 12:42:02 PM   
milne


 

Posts: 67
Joined: 4/27/2006
From: Brisbane, AUSTRALIA
Status: offline 		Hey there all,

I’m going to have a go at building a tuned pipe for my Pro Mac 28CC using the following internet site as guidance:

DIY TUNE PIPE
(Need JAVA if you want look at it)

Well I know the CC’s (28) of my PRO MAC but yeah that’s it, according to the program I need:

1. Velocity of Rotation (RPM)
2. Exhaust Port Angle (o)
3. Transfer Port Angle (o)
4. Exhaust Port Area (mm2)
5. Exhaust Gas Temperature (oC)

If anyone knows the data already or can help me find it by explaining or maybe even finding an internet site that would be so awesome !!! The hardest part is the exhaust head attachment as on this particular model they are just clamped on using some dodgy spring system that takes your eyes out when trying to take it off and replacing.

THANKS ALLOT,
milne

"If you require pics don’t hesitate to ask"
       Post #: 1

RE: "help" McCulloch Mac 2181 (PRO MAC) "... - 7/6/2006 1:25:39 PM   
milne


 

Posts: 67
Joined: 4/27/2006
From: Brisbane, AUSTRALIA
Status: offline

ANYONE able to understand what this all means??

< Message edited by milne -- 7/6/2006 1:28:49 PM >

(in reply to milne)
       Post #: 2

RE: "help" McCulloch Mac 2181 (PRO MAC) "... - 7/6/2006 3:04:14 PM   
davewallace


 

Posts: 1402
Joined: 1/15/2005
From: San Antonio, TX, USA
Status: offline 		Goodday Milne,
I think that your Pro Mac 28 is a standard Mac 28cc here in the states. I am attaching a picture and port timings. I don't have the port areas, but they are generous. It is a well made motor, tho a bit heavy.

Intake open 62 degrees BTDC
close 62 degrees ATDC
duration 124 degrees

Exhust open 70 degrees BBDC
close 70 degrees ABDC
duration 140 degrees

Transfer open 52 degrees BBDC
close 52 degrees ABDC
duration 104 degrees

Dave

Attachments
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_____________________________

Every day above ground is a good day.

(in reply to milne)
       Post #: 3

RE: "help" McCulloch Mac 2181 (PRO MAC) "... - 7/7/2006 9:53:40 AM   
milne


 

Posts: 67
Joined: 4/27/2006
From: Brisbane, AUSTRALIA
Status: offline 		ok thanks SOOOO much, i now need RPM of the engine? Exhaust Port Area? Exhaust Gas Temp?

Im guessing to find the gas temp you just put a themometer at the exhaust outlet for a min on high revs?
and for the Exhaust Port Area - ive got no idea
and the RPM i wonder if somone has a manual in it or somthing with the specs?

cheers, milne

(in reply to davewallace)
       Post #: 4

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Gas Engines >> "help" McCulloch Mac 2181 (PRO MAC) "28cc"
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