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May 07, 2019, 04:39 AM
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deeh_46's Avatar
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Question

.21 manifold and muffler on .30 engine


Like tittle says, could I run that setup?

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May 07, 2019, 06:00 PM
Registered User
Yes.
May 08, 2019, 12:37 PM
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deeh_46's Avatar
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Thanks
May 31, 2019, 10:25 AM
Registered User
Nope. Ever hear of the term 'tuned pipe'?
Aug 18, 2019, 10:19 PM
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deeh_46's Avatar
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I do, but what else to look for the specs that fit .30 engine?
Aug 23, 2019, 12:50 PM
GloBroz PowerLab
1QwkSport2.5r's Avatar
Pretty much any manifold and pipe will fit any engine from .21 to .32. While many companies will say this manifold or pipe is for a 3.5cc engine, it will fit all big blocks. While the difference between a 3.5cc (.21) engine and a 5.24cc (.32) may seem large, in reality, there isnt much difference. The difference you will see, hear, and feel, is in how the engine and exhaust system perform together. A sport engine with low timing will not feel very fast and seem flat on a short exhaust system whereas a high timed race engine will feel the same way on a long exhaust system. Another thing to note - those large bore short stroke engines like the .30 and .32 tend to not breathe quite as well as the smaller engines because they have to mill the inside of the crankcase out larger to fit the larger diameter cylinder liner. This will have a negative effect on breathing because there is less volume for the air/fuel mix to travel through. So a high rpm screaming engine may be appealing, but you would be disappointed by putting a short on-road style exhaust on a RTR or basic sport engine. LRP .30 and .32 engines are known to snap cranks if pushed too hard, so make sure your expectations are realistic.
Sep 13, 2019, 06:07 AM
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deeh_46's Avatar
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Thanks 1QwkSport2.5r for the info there.

I have Hobao Hyper .30 Red head version. I ended up took Reedy 2035 & 2039 + 28047 manifold as I got cheaper price. 2039 shorter than 2035 but I felt 2039 has more torque. I believe shorter exhaust is softer in low end. Will engine and exhaust match or mismatch each other?
Sep 14, 2019, 08:45 AM
GloBroz PowerLab
1QwkSport2.5r's Avatar
When the engine performs better with a given manifold over another, generally that’s a tell that the engine is getting “on the pipe”. That just means your exhaust system is working better than the previous system.


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