Difference Between 2.4 And 2.5

[skykingtim]

HOW DO YOU VISUALLY TELL THE DIFFENCE BETWEEN THE 2.4 AND 2.5 MERCURY POWERHEADS--ANY PART OR SERIAL NUMBERS ect.

[SatisfAction]

HOW DO YOU VISUALLY TELL THE DIFFENCE BETWEEN THE 2.4 AND 2.5 MERCURY POWERHEADS--ANY PART OR SERIAL NUMBERS ect.

The cylinder blocks are different. The charge ports are visible on the 2.4 block... they look like lumps on the sides of the cylinders. The 2.5 blocks dont have these as they are behind the liner.

[stiletto200]

any pics?
wre there any 200 2.5 in late 80's?

[SatisfAction]

any pics?
wre there any 200 2.5 in late 80's?

Don't think the 2.5's came out until 91'.

[T-REX]

hERE'Z A COUPLE PICS THAT WILL HELP YA IDENTIFY THA DIFFERNCE....ONCE YA GIT IT, IT'Z EAZY!!

[T-REX]

dAMM, fERGOT THA PICS.....TRY IT AGIN!!

[skykingtim]

thanks for the pictures--as the saying goes one picture is worth a thousand words

[stiletto200]

what tha??!
mine doesnt look loke either of those
all i can see is smooth bores it seems on the outside
mine wouldnt be a 2.0 would it?

[kingsbiship]

You have to take the cover off!

[stokernick]

ya think?

[stiletto200]

GEE are you sure?!
thought my x-ray vision would just tell me

[T-REX]

all i can see is smooth bores it seems on the outside
mine wouldnt be a 2.0 would it?


NO, The 2.0 iz like both!!...Tha older 2.0 looks like tha 2.4, and tha 91 up 2.0 looks like tha 2.5!!!.....

I don't know what U got over ther, aussy's had sum differt stuff fer sho!!...But I kan't see Mercury make'in a differnt block juss for ya'll, but ya never know bout mercury.....They coulda used Ford mota parts know'in sum ov tha stuff I've seen them do!!:eek: :D

[jimmyz32]

does anybody no the torque differance between the two of them 2.4 200 and a 2.5 200? do you think it could be 40 ft. lbs.?

[tuoppix]

I checked some spare blocks i have lying around to identify what I have. All are supposed to be 2.4s. One of them has the look of a 2.5 from the outside, as described earlier on this thread. However, the bore is 3.375" which is supposed to be 2.4s', right? The block is sleeved and the cylinder wall is thicker than in a block from a 86' V200 block. Could it be a 2.5 block with 2.4 sleeves in it?

[kingsbiship]

There were a couple years they produced 2.4L with the 2.5 porting! They call them 'Fat Blocks'

[Capt.Insane-o]

2.4 fat blocks never had 2.5 porting. They had 2.4 piston port sleeves in them with usually horrible port mismatch between the block and sleeve.

[patchesII]

The Fatblock 2.4's were still piston port motors. Just in the 2.5 block. They weren't behind the liner motors like the 2.5

[tuoppix]

Well, that explains why the '90 'fat block' in my vintage 17 feet monohull feels a bit heavier than my late '88 2.4 did. And more powerful as well. There's horizontal reeds, wmh2 carbs and 175 labels.. And if I ever build a motor of the spare fat block, which piston rings are to be used on it? The chromed or the steel ones?
Thanks for the replies!

[Capt.Insane-o]

Steel.

[kingsbiship]

Sorry for the mis-info