8.2 HO vs 520. Shockwave Tremor

[Craiger]

Considering purchasing new Shockwave Tremor Walk thru open bow. Not sure if it makes sense to upgrade to 520 from 8.2 HO. The 520 also requires upgraded outdrive as well. Looks like an additional $15k for the set up.

Pros and Cons from those with experience with both

TIA.

 

[Q4mtxUS]

520 will be 10 mph faster, and the exhaust note is angelic

Do it. You won't regret

 

[CobraDave]

520 has no cats. The 520 will come with hydraulic steering as a part of the package. Cool upgrade.


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[NicPaus]

I have a older HO wish i had the 525. Same comparison. I would do it all day long on a new build. I bought used.

 

[ltzcrew]

if you can do it, do it! i had a 575 in mine that got rebuilt after one year of use for more power.... hell the write up on the main page is about hopping up a magnitude

 

[BHC Vic]

520 all day

 

[Craiger]

Thank you to all who replied. Heading to Shockwave right now to order the Tremor. Will be ordered with 520 and dual hydraulic steering.

Now the wait begins !!

 

[CobraDave]

Thank you to all who replied. Heading to Shockwave right now to order the Tremor. Will be ordered with 520 and dual hydraulic steering.

Now the wait begins !!

Very nice choice! Keep us updated on the progress.


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[Lavey 29]

If your going to a production side engine. the 8.2 cat engine is NOT the way to go. I would do the Ilmor cat engine or the volvo cat engine - 300 to 350 Lbs less weight and will out perform the outdated build of an 8.2 L. I would bet there is not even 4000 of these 8.2 cat engines in boats and they have been out over 10 years now. They are not reliable at all nor sell either..

Not even 1 hp per cubes. 502 cid at 430 hp is laughable. hell that is so poor in the current engine world. You have 6.2 production marine engines not Mercruiser at 1.4 to 1.5 hp per cubes.

I would go with the 520 hp but again such an outdated platform.

 

[Lavey 29]

this would smoke that 8.2 Merc. Ilmor small block 454. at 850 lbs. compared to about 1200 lbs of the 8.2

MV8 570 | Ilmor Marine

Ilmor's High-Performance Marine engines stand alone in performance, appearance, reliability and efficiency.

www.ilmor.com

 

[Lavey 29]

another cat engine I would take over Merc cat engines. volvo cat engines. Less outdrive issues and less transom issues as well.

Aquamatic Sterndrive Gasoline Engine Range | Volvo Penta

Volvo Penta Aquamatic Sterndrive. The perfect choice – for watersport fun and leisurely cruising.

www.volvopenta.com