This is TikiWiki 1.9.7 -Sirius- © 2002–2006 by the Tiki community Tue 28 of Sep, 2021 [19:16 UTC]

Forum: Hot Heads Tech Talk

Forums->Hot Heads Tech Talk->

edit



 
on: Wed 31 of Dec, 1969 [23:00 UTC] reads:

Posted messages

Top
author message
bigdaddydon331
user offline
331 marine tare down
on: Fri 24 of Sep, 2021 [01:11 UTC] score: 0.00
Hi all, I just acquired a 331 marine engine that I am taking apart. It still has the crank gear on crank. Is there a special way this comes off? There is what looks like a straight blade screw in center of crank. Does this have something to do with it? looking for information before I go brutal on it. lol thanks


author message
Will68
user offline
REAR ENGINE MOUNTINGS ON 331 EXTENDED BELL ENGINE
on: Thu 09 of Sep, 2021 [18:35 UTC] score: 0.00
Can anyone tell me please how the rear of an extended block Chrysler 331 was mounted in a chassis ? I am mounting this engine in a "special" (1953 date) and cannot see any lugs or any other way of mounting the rear of the engine - other than making up some sort of fabrication. The front of the engine has the normal 331 lugs to put mountings on but there is nothing at the back. Were these engines only mounted at the back of the gearbox ? If so I would have thought that it would put a huge strain on the gearbox/engine flange due to the weight involved.
I have searched the web but can only find pictures of the front not the back. !
Any help much appreciated.
Thank you.

author message
Webmaster2
user offline
Re: REAR ENGINE MOUNTINGS ON 331 EXTENDED BELL ENGINE
on: Thu 23 of Sep, 2021 [09:20 UTC] score: 0.00
The rear motor mount is on the tail shaft.

author message
ron37
user offline
315 Hemi Pistons
on: Tue 31 of Aug, 2021 [15:26 UTC] score: 0.00
Weird thing happened. A guy got a 315 hemi that was from a running car years ago. He has finally got around to that project. He disassembled the engine and realized the pistons had offset valve notches, which means they were for a poly engine. How is it possible for a hemi to run these without the valves hitting the pistons? He said the engine was a car, not a truck.

author message
30redram
user offline
Re: 315 Hemi Pistons
on: Tue 07 of Sep, 2021 [02:54 UTC] score: 0.00
> Back in 1963 my Dad took a 241 hemi and bored it out .125 and installed used 259 poly pistons from a 55 Plymouth. We did not have any interference problems; however, we were using a stock cam.

author message
garyw
user offline
no oil to lifters
on: Sat 31 of Jul, 2021 [20:56 UTC] score: 0.00
tore down my 54 331 hemi put a new distribor in, oil pan head gaskets, manifold gaskets timing cover gaskets. started my engine up and i have 60 lbs pressure on the gauge but it seems like there is no oil on the lifters and no oil on the heads with the valve covers off. it was running fine till i reworked it the cam looked great lifters looked fine no scares or burnt marks I need some help. !!!!!!!!!!!!!!

author message
George
user offline
Re: no oil to lifters
on: Sat 14 of Aug, 2021 [15:29 UTC] score: 0.00
The hemis don't have huge oil up there compared to modern engines. So it may be oiling. Oil goes up a hole in the block/head/rocker stand. Next to the end stand, 1st one in from the end. Don't remember if head gasket is drilled to have the hole in right place if you put it on upside down.

author message
garyw
user offline
Re: no oil to lifters
on: Sat 31 of Jul, 2021 [20:57 UTC] score: 0.00
> tore down my 54 331 hemi put a new distribor in, oil pan head gaskets, manifold gaskets timing cover gaskets. started my engine up and i have 60 lbs pressure on the gauge but it seems like there is no oil on the lifters and no oil on the heads with the valve covers off. it was running fine till i reworked it the cam looked great lifters looked fine no scares or burnt marks I need some help. !!!!!!!!!!!!!!

author message
ron37
user offline
270 hemi pistons
on: Mon 03 of May, 2021 [18:38 UTC] score: 0.00
I have a 270 Dodge hemi and a set of .030 NOS 315 hemi car pistons that I picked up years ago at a swap meet. So when I get the 270 bored, if I use the 315 pistons, will it raise original 270 compression ratio from 7.6 to 1 to the 315 ratio of 8.25 to 1? The one book lists the pistons as 8.5 to 1. My Tex Smith hemi book says 8.25 to 1. Any ideas?

author message
George
user offline
Re: 270 hemi pistons
on: Sat 14 of Aug, 2021 [15:38 UTC] score: 0.00
depending on year the 270 was advertised @ 7.6 or 8:1, the 315 is advertised @ 8:1. Advertised is sometimes optimistic, especially on the low decks. Keep in mind the 315 is 8:1 with a longer stroke. You'd need to get down to serious measuring and calculating with the formulas to figure it out

author message
30redram
user offline
Re: 270 hemi pistons
on: Wed 26 of May, 2021 [04:00 UTC] score: 0.00
> I have a 270 Dodge hemi and a set of .030 NOS 315 hemi car pistons that I picked up years ago at a swap meet. So when I get the 270 bored, if I use the 315 pistons, will it raise original 270 compression ratio from 7.6 to 1 to the 315 ratio of 8.25 to 1? The one book lists the pistons as 8.5 to 1. My Tex Smith hemi book says 8.25 to 1. Any ideas?

After checking with my 1959 MOTORS manual, it appears the 270 and 315 have different wrist pin diameters. The 270 is .8592 and the 315 is .9216. Unless the small end of the rods can be re-sized to the 315 wrist pin diameter, it does not appear the 315 pistons can be used with stock 270 rods.

author message
30redram
user offline
Re: 270 hemi pistons
on: Wed 19 of May, 2021 [03:06 UTC] score: 0.00
> I have a 270 Dodge hemi and a set of .030 NOS 315 hemi car pistons that I picked up years ago at a swap meet. So when I get the 270 bored, if I use the 315 pistons, will it raise original 270 compression ratio from 7.6 to 1 to the 315 ratio of 8.25 to 1? The one book lists the pistons as 8.5 to 1. My Tex Smith hemi book says 8.25 to 1. Any ideas?

I have no hands-on experience with the 315, but I'll offer an idea on some checking you might consider. Take one of the 270 pistons and one of the 315 pistons, remove the wrist pin from one, slide the other piston's wrist pin half way out, then slide the first piston onto the second's wrist pin. Look at the piston tops and see if the 315 top is higher then the 270. If they are the same, there will be no change in the compression ratio. If the 315 is higher, there will be an increase in compression ratio. If it is higher, and you carefully measure the difference with a depth micrometer, plus use some careful math calculations, you can calculate the increase.

author message
392PT50
user offline
Head stud torque for aluminum heads
on: Sat 24 of Apr, 2021 [16:08 UTC] score: 0.00
Can anyone tell me the torque spec for Hot Heads aluminum heads with aluminum stands?

author message
Webmaster
user offline
Re: Head stud torque for aluminum heads
on: Mon 26 of Apr, 2021 [18:21 UTC] score: 0.00
> Can anyone tell me the torque spec for Hot Heads aluminum heads with aluminum stands?
I use 100 ft.lb., have fun, Bob

author message
murbas
user offline
331 hemi with backfiring problems
on: Sun 28 of Mar, 2021 [03:13 UTC] score: 0.00
i have a 331 hemi bored .040 over with 9 to 1 compression ratio, cam is an isky .485 lift 232 duration, 108 degree seperation, with dual holley 450cfm 4bbl's . headers are fenderwell exit with 3" collectors and baffles. car has a street/strip turbo 400 with a 3000 stall converter and 4.11 posi rear with 30" tall tires. i get backfiring occurring on ocasion under hard acceleration. can any help me with this problem ?

author message
Webmaster
user offline
Re: 331 hemi with backfiring problems
on: Wed 07 of Apr, 2021 [16:42 UTC] score: 0.00
Murbas: Sounds like you're running too fat. According to the calculations I use, your 338 at 6,000 rpm will wants 587 cfm. Try a smaller carb and see if that fixes it. Have fun, Bob






> i have a 331 hemi bored .040 over with 9 to 1 compression ratio, cam is an isky .485 lift 232 duration, 108 degree seperation, with dual holley 450cfm 4bbl's . headers are fenderwell exit with 3" collectors and baffles. car has a street/strip turbo 400 with a 3000 stall converter and 4.11 posi rear with 30" tall tires. i get backfiring occurring on ocasion under hard acceleration. can any help me with this problem ?

author message
hemistude
user offline
Re: 331 hemi with backfiring problems
on: Tue 06 of Apr, 2021 [19:47 UTC] score: 0.00
Is this a new build or has it been in place for a while and has run well in the past? Is it popping in the exhaust or through the intake? What does a compression check show? Is the vacuum steady or bouncy? Lots of clues can be had from those tests.

Does the mechanical advance work on your distributor? Have you confirmed the base and full advance timing settings? It should at full advance by 3000 rpm. You can rule out vacuum advance as the culprit -- it is not in play under acceleration.

If your full mechanical advance is between 28 and 32, then it shouldn't be popping because of SPARK timing. I always suspect VALVE timing next. Those "2 deg advance-straight up-2 deg retard" timing sets can be confusing to install. If that was set up wrong, it'll run but may give the symptom you are experiencing. Not necessarily the easiest thing to confirm but if everything else is right, that's all that's left.

Don't ask me how I learned this. confused Hope it helps,

Dave

author message
DaveBlakeman
user offline
Re: 331 hemi with backfiring problems
on: Thu 01 of Apr, 2021 [15:35 UTC] score: 0.00
Lean condition ,, leaky plug wires . Bent valve stem .

author message
392PT50
user offline
Breather setup?
on: Sun 07 of Mar, 2021 [20:48 UTC] score: 0.00
I need help finding a way to vent my 392 HEMI. I have the billet valley pan that has oil caps on either end. My valve covers are not an option. Does anyone have a setup that works that they'd be willing to share? Thanks!

author message
392PT50
user offline
Re: Breather setup?
on: Mon 08 of Mar, 2021 [15:08 UTC] score: 0.00
> I need help finding a way to vent my 392 HEMI. I have the billet valley pan that has oil caps on either end. My valve covers are not an option. Does anyone have a setup that works that they'd be willing to share? Thanks!


Page: 1/71  [next]

Show posts: