300R nonsense thread

[Jamie Nichols]

I got a price today for a 225 pro xs v8 fully rigged for $20,142.68 . Unfortunately my hull is rated for 225 and no one wants to sell me a 250. I'd love to hear that these new v8's can be tuned to make the full 300hp.

[PRE-Z06]

I got a price today for a 225 pro xs v8 fully rigged for $20,142.68 . Unfortunately my hull is rated for 225 and no one wants to sell me a 250. I'd love to hear that these new v8's can be tuned to make the full 300hp.

175-225 use the smaller throttle body and 250-300 use the larger throttle body, so only the 250 will be able to be turned up to 300 with just a tune. Though a throttle body swap may be possible on the 200&225 as the intake part # is the same on the less powerful V8s.

[Jamie Nichols]

175-225 use the smaller throttle body and 250-300 use the larger throttle body, so only the 250 will be able to be turned up to 300 with just a tune. Though a throttle body swap may be possible on the 200&225 as the intake part # is the same on the less powerful V8s.

Where can I find the schematics?

[RSWORDS]

175-225 use the smaller throttle body and 250-300 use the larger throttle body, so only the 250 will be able to be turned up to 300 with just a tune. Though a throttle body swap may be possible on the 200&225 as the intake part # is the same on the less powerful V8s.

Are they using a different TB or just a reducer like on some of the smaller motors? Haven't had time to look through the schematic

[PRE-Z06]

https://www.mercurymarine.com/en/us/.../parts-catalog

https://public-mercurymarine.sysonline.com/iOS/Default.aspx?sysname=NorthAmericacompany=GuestNA_KEY=NA_KEY_VALUElangIF=englangDB=eng

They show two different part # throttlebodies, a 64mm and 80mm.

They also have two different design intakes now listed I noticed a single piece and a two piece.

[Jamie Nichols]

It's interesting that they show 2 different intake systems listed as design #1 and #2.

[davemvegas]

As far as i know the coast guard spec sticker is only required when boat is sold new. I have owned several under 21 ft boats that i seemed to have lost the coast guard plate.

[PRE-Z06]

It's interesting that they show 2 different intake systems listed as design #1 and #2.

Yeah the 2-piece wasn't listed initially and the V6 still only shows a 1-piece intake, guess initially the V8 had a 2-piece and they changed it for some reason to the design II 1-piece intake.

[Jamie Nichols]

What do you guys think about the v8's having a counter ballancer running off of the timing chain? I keep picturing it coming apart if someone hit something solid with the prop.

[madmatic]

Eh, I'm not worried. You would probably blow up the lower unit before the timing chain comes apart or skips. Besides there are alot of v8s with balance shafts that seem to be just fine.

[2jz]

Mercury has me thinking these motors are build to order something like tesla cars. Talked to a guy this week he doesn't get his 250 motor till March 2019 wth. So I suggested calling Jaco marine they advertise having new v8 in stock his reply is I did they don't have any.

A whole year to wait on motors really!!
Demand might be high but when mercury released these motors only couple hundred had to have been built. More reason I say built on order

[powerabout]

its will be old fashioned before most get one?

[H2OPERF]

How many 4 stroke chain saws are out there.. yep some things like stvs and allisons were just meant to be powered by 2 strokes. anyone can have my spot on the buyers list im out...

[engineermike]

It’s tough to make 4-stroke oiling work on a chainsaw that must operate in any orientation. Apparently stihl is doing it though. Anyway, luckily, outboards don’t need to operate upside down or on its side.

[Davidlake]

They are 4 strokes, but use pre-mix. No crank case oil.

It’s tough to make 4-stroke oiling work on a chainsaw that must operate in any orientation. Apparently stihl is doing it though. Anyway, luckily, outboards don’t need to operate upside down or on its side.