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Thread: Show your DIY exhaust snouts
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07-30-2022, 02:37 PM #46Member
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07-30-2022, 03:00 PM #47
I can say no more on the topic of mad EFI mids. I mean everything I have said so far and out of respect for Todd and the company I will say no more. Some people love the mids. You will find out for yourself. I would take Chaz's contraptions or Michael Chapman's first over anything else on the market.
All I deal with is recreational boating aside from a few drag boats I mess with that all have 2.5s... so thats the kind of stuff my perspective comes from. I have a 20" offshore clamp and know where another one is. If that would help you can buy the two and send them to chapman to have them cut to 15. Cut offshore clamps do VERY well in my experience. They are lighter than a 15 cause there isn't the 2" of setback. They run good.
Attachment 508201
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07-30-2022, 05:11 PM #48
So a smooth back offshore mid and clamp can be cut to 15” and its actually good, not sketchy like a bass mid?
Hydrostream dreamin
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07-30-2022, 07:20 PM #49Member
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07-30-2022, 07:27 PM #50
It depends on what your kind of boat likes. My mirage runs insanely well with a cut 20" clamp (and factory can). The lack of setback and the 10 to 20 lbs lighter in the swivel bracket is beneficial.
Yeah cut offshore cans are WAY easier and safer cause they are cast with thicker walls. However, anything can crack, even a factory 20" offshore mid. I ran a factory 15" mid and a cut offshore can and the whole deal was SO heavy. It was solid and had no issues, but the cut offshore is heavier than a factory 15" can, plus the heavier bracket was 30+ lbs I bet.
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07-30-2022, 07:52 PM #51Member
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I wish S&F had a sticky on the basics of what you need to do to run a 15” can on a 7 cylinder. At least something that explains the different setups people have done.
I learn more and more about these things through you guys so thank you!
So from what I understand please correct me if I’m wrong…. To run a 15” mid on a 7 cylinder you need to either cut your current midsection or buy a madefi 15” midsection. In addition to that you will need to either purchase a 15” offshore clamp with a matching trim cylinder or you will need to cut your 20” clamp and trim ram. There are also some exceptions when it comes to what type of trim ram you want to cut..if it’s a 3 ram I don’t know who would cut that. If “offshore” single trim Ram I think Chapman will do that.
if you want more setback (+2”) do a 15” offshore clamp. If you want less set back (?”) you would cut a factory 20” mid that came with the motor.
if you have a 25” mid you cannot cut it down to 15”
is this correct?
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07-31-2022, 11:25 AM #52
The hydraulic trim ram has nothing to do with 15 or 20" You don't have to cut that. Theres less clearance for the front of the lower unit, but you can forget about that really.
3 ram and single ram clamps are nothing alike. They are totally different clamp brackets and heights for the steering arms. Chapman can make a 15" out of either trim setup, but you need the complete clamp+swivel+tilt mechanism. You can't mix and match much of the parts. Chaz also has cut 3 ram 20" clamps to 15 I believe...Last edited by 25two.stroke; 07-31-2022 at 11:28 AM.
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08-01-2022, 09:03 AM #53
Lets break "mid-section" down to their basic parts.
The "exhaust housing" (can).
The other being the "clamp bracket" which consist's of the side brackets, swivel bracket, trim cyl, tilt and swivel pin's along with the lower yoke .. I just call all of those parts .. "the bucket".
I don't really care for the 7 cylinders (opti-pop) ... I prefer everything else in the 3.0L family ... but if we are gonna call a "porkchop" a "porkchop" .. I rekkon we can call a 3.0L a 7 cyl. Just keep in mind that I refer the seventh cylinder as the nitrous bottle, not some gayazz parasitic air pump.
Lake, it looks like you have a can from two different batch runs. No big deal ... put them together and no one can see what the inside looks like ...
The reason no one used a three ram trim unit on a 15" can ... is because IT WONT FIT.
As stated, I did some piggyback units a while back ... if you get the standard unit to work ... I'll give you a job .. starting tomorrow.
All tiller arm / swivel pins wlll work. Some need a bit more machining , and I prefer the newer stainless units .. lower yoke too.
If you use a factory 15" buckets assy, it's a bolt in with only a lower yoke change to fit the 3.0L can.
If you shorten a 20" bucket, you will need to shorten the trim cyl as well. Some don't know how to do the cylinder. It's probably the same idiot who was cutting the lower boss off of the swivel bracket and just hammering a bushing back in the bottom. All was fine until the thin wall split up the middle after a few hours. So if your told you don't need a shorty cyl ... keep walkin ...
You will need a :
shorty cyl
short swivel bracket
short tiller / swivel pin
short shift shaft
short drive shaft
short water tube
Cut inner can / tuner
Other than that, piece of cake ...
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08-05-2022, 04:36 PM #54
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08-05-2022, 08:33 PM #55Member
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08-12-2022, 11:42 AM #56
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25two.stroke, mrichartz liked this post
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08-12-2022, 12:53 PM #57
Full length trim cylinders with 15" mids function they just don't get much negative trim. Most of the rec boats out here run long rams and put limit bolts so they cant under trim. They are easier to get parts for and replace than shorties. And yeah, most people don't mess with cutting and welding them like Chaz...
My DIY exhaust snout in the works...
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mrichartz liked this post
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08-12-2022, 02:38 PM #58
Last edited by mrichartz; 08-12-2022 at 02:53 PM.
LETS GO BRANDON.... LETS GO BRANDON
Sometimes I talk to myself...then we both just laugh and laugh
'84 Checkmate Convincor
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David - WI thanked for this post
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08-12-2022, 03:45 PM #59
Negative trim.
Yep, lethal
I have a boat here that in its past, was testdriven by a prospective buyer.
19ft 6, 80- 90mph boat.
They prospective buyer took off with the motor trimmed in and didn't get 100 meters before it hooked and threw both occupants out.
Badly damaged the boat.
I run it with a good mechanical trim gauge and a large warning mark.
Never thought of putting a trim pin back on it.Last edited by NZ Sidewinder; 08-12-2022 at 03:48 PM.
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09-11-2022, 01:58 AM #60
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25two.stroke liked this post
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