worth doing 3.5 inch 2.4 block?

[derekfl]

it seems a 2.5 block with 6 good bores is worth around 1k. at that price putting 6 sleeves in a 2.4 is close. and apparently one can also put 2.5 sleeves in a 2.4. any advantages or disadvantages to having a 2.4 block with new 3.5 inch bores for 1200 bucks or so? or are the ports so different that it is too much effing around?

[tlwjkw]

won't work..............

[derekfl]

chris carson tells me he has one he did that to.

[Jim Speros]

I got a fresh water FF 2.5 powerhead with one bad hole I've been sitting on. I kept it instead of returning as core.

[derekfl]

i know a guy wants it. he races an FF and wants a spare to build so he avoids downtime when/if it pops. what do you consider it worth? need bored or sleeve? thanks.

[Jim Speros]

Pretty busy now with moving. Its got to be worth 8 or 900 hundred. Had low compression on one cylinder. Pulled head, looks like ring broke. Never took apart. Spayed a can of storage seal on crank bearing and covered up.

Its not going anywhere anytime soon.

[tlwjkw]

chris carson tells me he has one he did that to.

really??? piston ports or behind tha liner porting???

[derekfl]

i don't know. i would assume matching the liners to the block.

[tlwjkw]

if it was anyone else but Chris i'd call bs on it.... would like ta see tha results though..

[derekfl]

i need to discuss this 2.0 he bought from me. i will ask more detail. i would not throw names around. especially not his.

[H2OPERF]

I had a 2.4 that was sleeved to a 3.5in bore it can be done. The sleeves have a huge 1 inch flange at the top, about 1/4in thick so you have to do quite a bit of block work. It used the same trough/piston porting as the 2.4 not a behind the liner and the pistons were special order too. The P/N for the sleeves was FL-014-ds I think, I was told Dick Sherrer out west was the one who originally had the stuff made up. Mine ran great turned like a banshee with small rods, it was long before people were top pinning and i had several dowel pins migrate but that was the only problem it ever had. . I prob have the piston p/n somewhere...

[tlwjkw]

guess like "they" say.. time and $$$ can do wonders.. had heard some tried it but it wasn't justifiable cost and performance wise.. that was back in early '90's... if it was before top pinin' tha rings then tha 2.5 was still on tha drawin' board............ we were top pinin' and o-ringin' 2.4's back in tha mid '80's 'cause of rpm and comp we ran.. no one is gonna put that kinda $$ and time in tha lowly "little" motors anymore anyway.... all tha good stuff (2.0, 2.4, 2.5) is gonna be justa memory sooner than we think looks like anyway..............

[derekfl]

so the answer to my orig question is it is not worth it. it is not all same-same as putting a 2.4 sleeve in a 2.4 or a 2.5 sleeve in a 2.5. if you want the extra 100 cc's in a 2.4, it is not gonna come cheap and easy... my dad was an engineer. he always said if it can be made, it can be fixed. but that doesn't mean it is worth doing though.

[johnmiffco]

dont know where u will get a machine shop to buy 6 sleeves,,,50-75 each
then bore block install sleeves and bore /hone to size for around 1k
when the install labor only starts @ 250 each hole,,,,
back in the 80s when we drag raced them 2.4 as that all we had gaylyn used to
make us 2.5 and 2.6 sleeves and put em in ,,,we found out the transfers and finger ports didnt flow enough air/fuel
so welded pockets on outside of block and ground forever to gain transfer flow to piston top
was worth it then,,,,,
but when 2.5 came out with behind liner porting was less piston disturbance to the intake side and flow gain was better than 2.4
as why merc made the change,,,,,hottest 2.4 from merc was 245hp,,,,300 from the 2.5,,,
so if ? is it worth it,,,,,
no since 2.5 is more efficient than 2.4 as a starting point for stock or hot
now if want to make a morfed motor,,,,,,,,,,,,
the best we tried was the bridgeport 2.0 F1 motor merc made in the 2.5 block casting for a couple yrs
gaylen made some 2.5 bridgeport sleeves for it
now had major exhaust flow with the more efficient behind liner intakes when ran on alcohol with 200 shot nitrous
was a beast and that was worth doing for an unlimited 2.5 motor,,,,

[25two.stroke]

Yeah on a 2.4 I think doing behind-the liner porting is a more profitable upgrade than going to a 3.5" bore and leaving the piston porting. Thats my opinion. Both are quite a bit of work. Behind-the-liner porting will yield more hp at the end of the day. I saw a 2.4 carb motor with that done to it and it ripped hard in 1/4 mile. Definitely out-ran a lightly modified 260. Like what was mentioned above...when you increase the displacement you gotta increase the air/fuel volume that is transferred...and on a 2.4L fingerport motor there's not much room to increase that; its pretty maxed out.