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MacStar .28 questions

 
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redlined_b16a



Joined: 29 Jun 2008
Posts: 91

PostPosted: Sat Sep 11, 2010 8:51 am    Post subject: MacStar .28 questions Reply with quote

I own a PBS with a Mac....I love it,Easy to tune,holds a tune and packs more than enough bashing power.Its a good engine.I just past the 1.5 gallon mark still on the break in settings and my buggy is like a rocket.

Question is Who makes the MacStar?
Where is it made?
Are there any other size Macs

Im just tired of giving positive feedback about the engine and all I get in replies is its a piece o crap blah...blah...blah
one guy stated that Dynamite made the engine and it was such a piece of crap that they wont even claim it.

Sure the Mac cant keep up with my Ofna .28 force purple head,the force has better low rpm power but I find that the Mac has a long powerband,from mid to high she pulls the strongest,low rpm is ok
plus my buggy is heavier than most,I built a custom mig welded steel cage,dune buggy style,and custom built an aluminum adaptor plate for a rotostarter
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redlined_b16a



Joined: 29 Jun 2008
Posts: 91

PostPosted: Wed Sep 15, 2010 6:27 pm    Post subject: Reply with quote

I removed both my Button heads today the .28 force and the .28 mac to check out the head color and glowplug cause that tells you alot about how the engine is running.How come the .28 force is larger than the .28 macStar.How is the size determined.I thought all .28's were the same size bore but the mac is way smaller than the force .28....what up
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David S.



Joined: 04 Apr 2008
Posts: 420

PostPosted: Thu Sep 16, 2010 7:06 am    Post subject: Reply with quote

A different bore, and stroke can be used to achieve the same size engine (cubic inch) Very common in 1:1 car engines.

Hyper: bore....18.35mm
stroke...17.5mm Longer stroke/smaller bore

Force: bore....19.0mm
stroke..16.8mm Shorter stroke/larger bore
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redlined_b16a



Joined: 29 Jun 2008
Posts: 91

PostPosted: Thu Sep 16, 2010 11:28 am    Post subject: Reply with quote

So what's up with the Mac history,will installing a boost bottle help the engine
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VWVR6_T



Joined: 23 Aug 2009
Posts: 384
Location: Western, PA

PostPosted: Fri Sep 17, 2010 9:07 pm    Post subject: Reply with quote

pipe, good nitro % fuel and good tunin will help the engine, I dont see the use of those bottles, IMO they are a joke.
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redlined_b16a



Joined: 29 Jun 2008
Posts: 91

PostPosted: Sat Sep 18, 2010 5:56 am    Post subject: Reply with quote

I remember in my gas rc boat days we used to add a 1/8" aluminum plate to the inside of the backplate,reducing the amount of room in the crankcase,I don't remember what it did or wh,lol
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VWVR6_T



Joined: 23 Aug 2009
Posts: 384
Location: Western, PA

PostPosted: Sat Sep 18, 2010 9:38 pm    Post subject: Reply with quote

If you reducing the amount of space inside the crank will create more presure in side the block sending more fuel to the chamber, you also will cut the run time some. With the new engines breed I don't thing you can do it, it is very tigh inside the crankcase.
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lanshan75



Joined: 09 Nov 2012
Posts: 4
Location: New York

PostPosted: Fri Nov 09, 2012 8:26 pm    Post subject: Reply with quote

I have been annoyed by this problem for a long time,so thank you for your post, it is really useful for me.
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