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Engine for STR

Old 07-09-2006, 01:37 PM
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the_yeti
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Default Engine for STR

Hey I know this has probably been asked before but, I have a new rossi black magic .21 that I had as a backup for my 1/8th scale buggy and am considering a st-r. Would this motor be okay for it? or should I go with a larger displacement or a .21 with a different torque/rpm curve?


thank you
125R21 Black Magic
Hp 2,85
RPM 37.000
Bore (mm) 16,44
Stroke (mm) 16,48
Ports 6
Crankshaft & Type Ø 14 SG
Glow Plug Standard
Old 07-09-2006, 01:42 PM
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TGreg24
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Default RE: Engine for STR

first off those black magics are like bats outta hell, and just because its a truggy doesnt mean you need a big engine, someone told me that the ST-R's dont like big blocks and their geared for .21s.

id say that that black magic is perfect.
Old 07-09-2006, 01:58 PM
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PillowPants
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Default RE: Engine for STR

That should be fine! ST-R's really seem to be geared towards .21's. I run a Rossi P5X in mine with a MSR1005 pipe and a werks conical header and it rips! You can't go wrong with any high end .21 in the ST-R. I've seen guys show up with modded novarossi .28's and make complete fools of themselves with all of their absolutely unessicary overkill power! And for those who can control it, they are making pit stops for fuel every 2 laps!
Old 07-09-2006, 06:44 PM
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Default RE: Engine for STR


ORIGINAL: TGreg24

first off those black magics are like bats outta hell, and just because its a truggy doesnt mean you need a big engine, someone told me [that the ST-R's dont like big blocks and their geared for .21s.id say that that black magic is perfect.
He's a smart guy who ever he is.. Oh wait it was me..
Old 07-09-2006, 07:08 PM
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TGreg24
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Default RE: Engine for STR

i thought it was you lol
Old 07-09-2006, 07:41 PM
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the_yeti
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Default RE: Engine for STR

Thank you for the info black magic it will be then
Old 07-09-2006, 08:15 PM
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the_yeti
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Default RE: Engine for STR

One more question which header and pipe do you guys rec for it. The magic is suppossed to be high torque anyways so would you run an 086 to get more high rpms or what?

Thanks in advance
Old 07-09-2006, 08:37 PM
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Default RE: Engine for STR

^^ I'd go with the MSR1005 pipe and the werks conical header of your choice. Short length for more top end, medium length for an all around gain, or long length for more low end.
Old 07-12-2006, 04:32 PM
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Haulin bass
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Default RE: Engine for STR

Go with a werks 053 conical setup for pipe or a AXErossi adjustable.With the werks you will have to bend the header slightly but its all golden after that.

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