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Oct 14, 2019, 10:50 AM
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Discussion

Zelos 48G top speed secrets


Ok guys I have a new Zelos G 48 with no mods done to the motor...only a Zipps super tune pipe. I can't seem to get past 45.3mph and would like some helpful advice on what might be needed to get me in the 50's. I'm currently running a Prather 275 prop but have tried a 280 and that seemed to slow it down...never reaching the motors rpm power band. The original 3 blade prop was the worst at 41.6mph via GPS. I've got the Zipp pipe set exactly at 13.5" as instructed.

This boats gotta have more in it? I'm thinking I just haven't found the right prop to wake it up and was hoping someone on here could help. The motor is slated to undergo some internal mods soon but was hoping I could break 50 before that. I also plan on installing an inboard tiny tach to capture max rpm.

Thanks! Terry
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Nov 10, 2019, 05:45 PM
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Well I believe today I have things on the right path. Our club's engine builder completed the mods on my stock motor so that along with an ABC 2714/15 prop from Bob English pushed this Cat to 65.1 mph via onboard GPS today...very happy!

Bob English...your props are amazing!
Last edited by tmicallef; Nov 10, 2019 at 09:09 PM.
Nov 11, 2019, 12:36 PM
Feeling lucky .... Punk
joel63's Avatar
Sweet !
Nov 11, 2019, 01:12 PM
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Mods.... piston is modified and lightened, the transfer ports are reshaped and bigger, the intake port and the exhaust port is bigger and retimed, the squish is set, and burn chamber is in larger, the crank is trued and the carb is modified to.
Last edited by tmicallef; Nov 13, 2019 at 09:20 AM.
Nov 15, 2019, 12:47 AM
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1/2A Nut's Avatar
Big leap in speed but then again going from 3 blade to 2 blade of the right size and pitch can do that. Torque % is put to better use disk area can be larger pitch can be more aggressive. Wonder how much actual rpm on the top end was being made.
Nov 15, 2019, 05:35 AM
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I have a tiny tach that I will be installing in the Spring to capture max rpm. Curious as well.
Nov 25, 2019, 07:20 PM
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Installed my tach today with a custom mount from my fab guys at work.
Dec 05, 2019, 03:02 AM
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Nice spot for it look forward to the data.
Dec 05, 2019, 12:49 PM
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Yup...the only unknown at this point is max rpm.
Last edited by tmicallef; Dec 05, 2019 at 12:55 PM.
Dec 05, 2019, 12:51 PM
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Here's that 65 mph run. I think it's got more it!

Zelos 48G AKA (King Zeus) turns 65 mph! (1 min 54 sec)
Dec 06, 2019, 09:58 PM
Feeling lucky .... Punk
joel63's Avatar
Sounds really good Terry !
I'm trying to decide what prop to try with mine.
I got the listed optional 2 blade prop from Horizon, I'll probably try it but will need a spacer to put in between the prop and nut. They advertised it as stainless, but it's obviously aluminum LoL.
Dec 06, 2019, 10:10 PM
Feeling lucky .... Punk
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Double post error
Last edited by joel63; Dec 06, 2019 at 10:30 PM. Reason: Double post error
Dec 09, 2019, 10:14 AM
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Nice spot look at all that flat water!
Dec 22, 2019, 07:52 AM
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Apache Kemosabi's Avatar
Not been funny but there are loads of much better cats out there if speed is what you want , i wouldnt waste my time and money on this hull by putting a modified engine into it . 65 mph with a modded engine in a cat is not fast ive had a 50" Thunderbolt to over 75 with a modded zenoah without too much trouble .


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