Tunnel Ram Engines

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10-26-2016 | 07:30 PM

#81

iliveonanisland

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Quote:

Originally Posted by jdnca1

Here's Wette Vette's 598....picked up 4 mph by going from Single plane 1250 Dominator to Tunnel ram and 2X1050 Dominators over the winter in single engine cat....

How's that for a real world comparison...

oh yeah, and the boat accelerates harder just about everywhere (except maybe planing off)

How much more fuel do u burn?

10-26-2016 | 08:38 PM

#82

iliveonanisland

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Quote:

Originally Posted by 2112

Mcolliston;

I am glad your back (although less prolific). Very acerbic wit

.

Wouldn't the O2 sensors now available help you tune old tech carbs even better than before?

On a related but different topic, Anyone know the CFM capability of the largest Weber Carbs (I think they are referred to as 48 ID which I assume means 48mm diameter throttle body)??

Yes on the o2 set up for tuning the carbs.

I wouldnt bother with webers as any thing ur bldg for a boat is probably gonna want a dominator

10-26-2016 | 08:47 PM

#83

iliveonanisland

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Quote:

Originally Posted by offshorexcursion

Not sure I agree.....we have T&D steel shaft rockers, 55--60mm cams with larger body .903 lifters, spin Tron tests, plus tons of real world testing. Shoot even the realization and attempts to improve valve train instability has to have helped.

I hope the technology is actually here to make the power and the marine world is just to lazy to utilize it so they just go straight to forced induction.....I don't know. I just don't think there's an EXCUSE for Marine N/A engines to have hit a power plateau.

I also don't believe you have to run high RPM to make power.....again..... technology.....dude it's been over 10 years!

Bring outthe four valve dohc bbc some titanium rods and its a perfect world foe 1000hp na hi rpm durable engines

10-28-2016 | 10:26 AM

#84

Uncle Dave

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Quote:

Originally Posted by iliveonanisland

Bring outthe four valve dohc bbc some titanium rods and its a perfect world foe 1000hp na hi rpm durable engines

I don't see that marine NA engines have hit a power plateau. The NA stuff is just getting better...

I can get 1000HP from a 2 valve 800CI engine with kitten like manners. Why bother with the complexity?

My "relatively" cheap new 588 makes 800Ft LB,

BUPS new 665 will make 900/900...

UD

Last edited by Uncle Dave; 10-28-2016 at 10:48 AM. Reason: spellin....

10-31-2016 | 01:26 AM

#85

iliveonanisland

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Quote:

Originally Posted by Uncle Dave

To get longer life out of em need to lighten up the rotating assm. 4 valve dohc and you could fev em higher not have to run a bunch of spring pressure or lift... would be a much lower maint package with a lot more longevity

10-31-2016 | 12:08 PM

#86

Uncle Dave

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Quote:

Originally Posted by iliveonanisland

For sure you can potentially lighten the valve train with a DOHC 4V setup and turn more RPM, but you still pay the complexity cost at build and rebuild time with much more machine work and parts overall.

Pretty sure the high RPM DOHC designs are solid shim under bucket vs hydraulic- thats a hell of a lot of stuff to pull apart and adjust manually at regular intervals.
One could make it a forked tappet like my old GS1100's were.

With bigger cubes you can turn the RPM down keep your spring pressure in check and bring back your longevity without the complexity cost and maintenance.
Alexis 800 cube deal turns 8K, if you turn that down to 6 you get lots of life and still tons of power.

The concept of a giant motorcycle engine is appealing for certain!
Maybe Merc will make an NA version of their DOHC deal some day.

UD

Last edited by Uncle Dave; 10-31-2016 at 03:29 PM. Reason: corrected CI on BP engine

10-31-2016 | 03:43 PM

#87

iliveonanisland

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Z1s had shim over bucket a gazillion of em were soldd. Easy as hell to maint.
the valve train never needs much maint cuz the bucket doesnt side load the valve and wear out the guides.

If merc built em theyd still cost huge coin. The tuff part is how to retro fit and drive the cams i think. If it was a bolt on head to old school block they would sell like crazy

Last edited by iliveonanisland; 10-31-2016 at 03:46 PM.

10-31-2016 | 04:01 PM

#88

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From: On A Dirt Floor

Quote:

Originally Posted by Uncle Dave

Maybe Merc will make an NA version of their DOHC deal some day.

UD

I may be wrong, usually am,but I thought Merc said that they now offer the motor without Turbo's...Something like 800HP or something like that. Not like anyone has bought it...but...thought I'd bring it up in case my memory for some reason is correct.

10-31-2016 | 04:11 PM

#89

Uncle Dave

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Quote:

Originally Posted by SB

Heard about these things in the wild at shows never seen one in a boat. Sounds *****in.

UD

10-31-2016 | 04:17 PM

#90

Uncle Dave

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Quote:

Originally Posted by iliveonanisland

I guess if you have the room you could make it easy- I always think of working on bikes and shim under is basically searing in hell the duration of the job .

The bolt on 4V heads always seemed like a good idea, and several guys have tried the "bolt on 4V head" thing like ARAO and and one or 2 others I don't think Ive ever actually seen the heads outside of the interwebs.
Arao basically seems to be a con artist.

UD

Last edited by Uncle Dave; 10-31-2016 at 04:27 PM.

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