Re: cubic inch vs. "the budget"

DanH October 18th 2011, 5:11 pm

bruno wrote:
605FOX wrote:what did you decide Bruno ???

nothing yet ..... i have a couple of other projects im working on ....

im thinking about leaving the eddies on there this go around and just changing the stroke/compression like Lem had suggested in a post.

same bore, 4.6 arm for 601 cubes raise the compression to say 14 - 14.5 by milling the head and changing the cam ...what rod will i need ?

like said , don't mill the heads . can use a 6.800 rod with a 4.600 crank , piston ch would be 1.200 " ( approx) depends on deck ht. now .

down side of cutting the heads is you lose piston to valve clearence , top ring placement .to keep p/v clr

Lem Evans October 18th 2011, 5:28 pm

The cleanest deal would be to use the 4.5" stroke and drop the rod from 6.800" to 6.700" and be able to use your exsisting pistons.

dfree383 October 19th 2011, 2:42 am

I'd be shy about reusing pistons that have had alot of NO2 time on the the stuff is real hard on Rings and Ring lands. IMO get a whole new rotating assy if you want more inches, Don't get cheap on the pistons, it may not be worth it.

bruno October 19th 2011, 7:05 am

dfree383 wrote:I'd be shy about reusing pistons that have had alot of NO2 time on the the stuff is real hard on Rings and Ring lands. IMO get a whole new rotating assy if you want more inches, Don't get cheap on the pistons, it may not be worth it.

sir if the amout of spray i put on these guys messed them up in any fashion , i just need to look at another 1100.00 piston company

i would think the jap crank has had the hardest life in my 2 engines ...just saying

dfree383 October 19th 2011, 7:11 am

bruno wrote:
dfree383 wrote:I'd be shy about reusing pistons that have had alot of NO2 time on the the stuff is real hard on Rings and Ring lands. IMO get a whole new rotating assy if you want more inches, Don't get cheap on the pistons, it may not be worth it.

sir if the amout of spray i put on these guys messed them up in any fashion , i just need to look at another 1100.00 piston company

i would think the jap crank has had the hardest life in my 2 engines ...just saying

Exactly how much have you been spraying? How many Runs on the engine?

400+ shots start getting into maintance / Replacement of parts more frequently than a typical NA motor.

bruno October 19th 2011, 7:41 am

dfree383 wrote:
bruno wrote:
dfree383 wrote:I'd be shy about reusing pistons that have had alot of NO2 time on the the stuff is real hard on Rings and Ring lands. IMO get a whole new rotating assy if you want more inches, Don't get cheap on the pistons, it may not be worth it.

sir if the amount of spray i put on these guys messed them up in any fashion , i just need to look at another 1100.00 piston company

i would think the jap crank has had the hardest life in my 2 engines ...just saying

Exactly how much have you been spraying? How many Runs on the engine?

400+ shots start getting into maintenance / Replacement of parts more frequently than a typical NA motor.

ive sprayed the engine with a 73 jet about 25 times( 175 hit), 83 jet about 5 times(225 hit) and the 73jet on the plate and a 20 jet in the fogger 4 times(300-325 hit) @ the bash with the fogger on for 1 sec ......

total runs on this engine probably 100-125 max

dfree383 October 19th 2011, 7:43 am

OK Shouldn't be an issue..... I have a couple of friends spraying big hits and they do wear out rings and lands pretty fast.

bruno October 19th 2011, 11:39 am

dfree383 wrote:OK Shouldn't be an issue..... I have a couple of friends spraying big hits and they do wear out rings and lands pretty fast.

thxs for the input

richter69 October 19th 2011, 12:00 pm

what CC are the heads now Nick?

bruno October 19th 2011, 12:04 pm

richter69 wrote:what CC are the heads now Nick?

72cc

richter69 October 19th 2011, 12:16 pm

I'm with the others, 4.5 crank, 6.7 rod, maybe a mafia intake, get after the fogger....................that combo will get after it and not break the bank.

lghting94 October 19th 2011, 12:17 pm

Some quick calculations show that if all else stayed the same(heads, pistons, head gasket) changing from a 4.300 stroke 6.800 rod to a 4.500 stroke 6.700 rod should gain right at .6 in compression.

bruno October 19th 2011, 12:23 pm

lghting94 wrote:Some quick calculations show that if all else stayed the same(heads, pistons, head gasket) changing from a 4.300 stroke 6.800 rod to a 4.500 stroke 6.700 rod should gain right at .6 in compression.

right now she is at 13.16

lghting94 October 19th 2011, 12:29 pm

is it possible to run a thinner head gasket to increase compression rather than shave the heads?

bruno October 19th 2011, 12:29 pm

DanH wrote:
bruno wrote:
605FOX wrote:what did you decide Bruno ???

nothing yet ..... i have a couple of other projects im working on ....

im thinking about leaving the eddies on there this go around and just changing the stroke/compression like Lem had suggested in a post.

same bore, 4.6 arm for 601 cubes raise the compression to say 14 - 14.5 by milling the head and changing the cam ...what rod will i need ?

like said , don't mill the heads . can use a 6.800 rod with a 4.600 crank , piston ch would be 1.200 " ( approx) depends on deck ht. now .

down side of cutting the heads is you lose piston to valve clearence , top ring placement .to keep p/v clr

But still having to buy new pistons

bruno October 19th 2011, 12:30 pm

lghting94 wrote:is it possible to run a thinner head gasket to increase compression rather than shave the heads?

we are running a .040 comp. gasket right now

richter69 October 19th 2011, 12:38 pm

hell unless the deal is hurt I'd leave it be, forget about the plate and get after the fogger with a man shot......bang for the buck right there.

Lem Evans October 19th 2011, 12:44 pm

bruno wrote:
lghting94 wrote:Some quick calculations show that if all else stayed the same(heads, pistons, head gasket) changing from a 4.300 stroke 6.800 rod to a 4.500 stroke 6.700 rod should gain right at .6 in compression.

right now she is at 13.16

Put a steel rod in it and the piston can be .010" closer to the head.....more comp. ratio.

IDT-572 October 19th 2011, 12:48 pm

Lem Evans wrote:
bruno wrote:
lghting94 wrote:Some quick calculations show that if all else stayed the same(heads, pistons, head gasket) changing from a 4.300 stroke 6.800 rod to a 4.500 stroke 6.700 rod should gain right at .6 in compression.

right now she is at 13.16

Put a steel rod in it and the piston can be .010" closer to the head.....more comp. ratio.