Viper is within . 21 mph of hitting 80

It would take a dedicated exhaust fix to get to 200 ps hp. The reed front half and extra main bearings is half the equation. Those deflectors on the pistons are of no help either.

Thank you Captain. It would be cool to figure it out if it wasn't to hard. After all the motors I've had. Looking at the inline on my Vector is just trips my trigger.

As you know they made a tons of these. I'm amazed to see how many guys have a tremendous affection for these engines. It has been a great experience to share there knowledge and experiences. It's been fun.

Charlie,

Before I forget. I want to apologize if I high jacked your post. My ideas and enthusiasm
got the better of me today. I can delete or move if this is a party fowl.

Scott

Can someone explain those little things sitting just in front of inline six carbs please. Do they direct air into the carb or something totally different? What happens if you remove them?

Wondering if any L6 prototype loopers where done based on the L3.
Could have gone either way on order, triple over triple 123-456 as T2, or alternating 135-246 as T1.
If you're building a new block.

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Originally Posted by Da Bull

Can someone explain those little things sitting just in front of inline six carbs please. Do they direct air into the carb or something totally different? What happens if you remove them?

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Bell type mouth piece on front of the carb opening?

Look up Dick Austins Looper Beast...absolutely an amazing build start to finish. A lot of "motor builders" that are actually just "put togetherers"...Dick actually built a motor.

Attachment 479193

Yeah those are wild. I was thinking factory Merc new generation tower of power. Would have more displacement too.

Spray fixes everything

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Originally Posted by mrcrsr

Spray fixes everything

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How do the plugs look so far?

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Originally Posted by scott reierson

" I'm actually thinking about this, and may weld bungs in and crankcase inject it, I've got an extra brucato computer. I have an extra t2x front, and another complete running 1987 adi 115, I do need the xs port specs, and I'll put a set of wiseco in it so I can spray it."

Gentlemen,

Please read my thoughts below...

I have spent a ton of time speaking to my friends on inlines. Most of us know or have already taken these engines to the current limits of the design.

After 50 or so High Perf Boats I currently have a love affair with a 1973 Vector with a 1973 150HP 15" Inline 6. All the work has been done to make it as good as it can be to perform the way it should. However, I want more out of my inline. I have passed on the 1500XS and Twister style upgrades

It appears to me the wealth of knowledge and ideas with the men I have spoke to, are at a point where I may want to experiment with one of my inlines, and take another step unless it has been done already. The goal is a nice running and reliable recreational motor for those of us who have inline 6 applications for smaller boats such as our Hyrdrostreams and other boats like them.

How about a 200hp propshaft goal at 6250-6500 using 91-93 octane non ethanol gas with Aces additive if required. 50:1 or 40:1 gas oil mix. No oil injection:

Machine, upgrade, fabricate block to add more robust block and crankshaft support
Port block to support EFI application
Delete reeds on crankshaft.
Machine cylinder head off
Fabricate stock intake to EFI design with throttle bodies and reeds on the intake.
Off the shelf (OTS) injectors and programable EFI system
ADI or equivalent ignition system with enough power to support EFI system
Best stock or after market Rods, and correctly ported Pistons
Balance internal reciprocals. Magnaflux, Shot peen, Cryo or equivalent procedures for reliability
Fabricate stock cylinder head or new removable 1 piece cylinder head or 6 individual heads with Girdle(s) using adjustable CC chambers
Correct (OTS) exhaust adaptor and tuner to bolt on to factory 15" or 20" inline 6 mid
Use as many many stock or modified stock parts as possible.
All must fit under stock wrap cowl or an affordable aftermarket 1 piece factory style cowl

I have a 15" Merc V6 I can put on my boat anytime, Just want to see what you all think.

Respectful, Replies, Calls or Email with your thoughts would be appreciated. Scott 608 347 0027 or [email protected]

To be clear to all, I am 65, dumb an idiot and a fool. No reason to turn this into a **** show.

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I wouldn't spend that much time on an antiquated design, just want to build a hot rod inline, using some modern technology

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Originally Posted by FMP

How do the plugs look so far?

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Rich, but that engine is coming off, will get 10/10 cages, and I'll build a proper tuner for it, but leave it mostly stock

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Originally Posted by Da Bull

Can someone explain those little things sitting just in front of inline six carbs please. Do they direct air into the carb or something totally different? What happens if you remove them?

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Velocity stacks

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Originally Posted by FMP

Quick reference, on an L6 thread here , pictures are shown , comparison between the L6 models. ADI are lower. I'll try to find those pics again and look.

Taller how unless I miss your description, difference of piston top to bottom of port at BDC? Also the actual port roof to piston top in degrees, adi isn't higher ported (lower ° from TDC) in or out .
XS actually has higher tranfers (lower number of degrees from TDC) than T1&T2 from stock specs posted. You have a chance to degree one and confirm.
Exhaust on twister is higher than XS, lower number of degrees from TDC.

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The adi transfer ports are .045 Lower than an xs, which will kill top end rpm. Just picked up a 90 to port. I'm going to put the transfers .010 less than the xs, and probably go the same exhaust height as the xs. This thing with efi will have more bottom end torque with a common plenum intake than the stone age carbs would ever have, and I may even put the block in the press, I'll try that on a junk block first, and going with hi domes, compression will help the tork problem, and also going to focus on raising the crankcase compression. But this engine will also have spray

Tweak the prop a bit? There’s always a faster prop