TJ's Motors built/in (working on KR issues now, update 9-12) - Page 7 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 08-01-2007, 03:44 PM   #61
Senior Member
Certified GM nut
Thread Starter
 
Join Date: Dec 2002
Location: plattsburgh NY
Posts: 2,037
Thanks: 0
Thanked 0 Times in 0 Posts
TJ'sblackbonne is on a distinguished road
Default

Yea, i was thining of asking you to today at work, just in case.
TJ'sblackbonne is offline   Reply With Quote
Old 08-03-2007, 06:48 PM   #62
Senior Member
Certified GM nut
Thread Starter
 
Join Date: Dec 2002
Location: plattsburgh NY
Posts: 2,037
Thanks: 0
Thanked 0 Times in 0 Posts
TJ'sblackbonne is on a distinguished road
Default

Name:  Springs.jpg
Views: 2
Size:  20.6 KB


More goodies arrived today, thanx Andrew.
TJ'sblackbonne is offline   Reply With Quote
Old 08-03-2007, 06:49 PM   #63
Senior Member
Posts like a Camaro
 
Join Date: Oct 2006
Location: montreal canada NEBF07 ONBF07
Posts: 987
Thanks: 0
Thanked 0 Times in 0 Posts
firebuick is on a distinguished road
Default

wow nice are those springs use so i think that L36 will see 6000 plus RPM
firebuick is offline   Reply With Quote
Old 08-03-2007, 07:04 PM   #64
Senior Member
Certified GM nut
Thread Starter
 
Join Date: Dec 2002
Location: plattsburgh NY
Posts: 2,037
Thanks: 0
Thanked 0 Times in 0 Posts
TJ'sblackbonne is on a distinguished road
Default

Yea they are used. They have about 15K on them, but were tested and came out great. Well it may see over 6000. I will probably start out at around 6100 and jump on a dyno and see how the curve looks, if it is still pulling i may up it a little more. I know the 4t60e'* dont like high revs so i am not going to push it but i would like to capture as much of the cams powerband as i can.


PS- the springs do not look anything like that right now. Andrew cleaned them up and they look sparkling new. That was the pic he sent me, i took another one but dont have the time to let it upload and what not.
TJ'sblackbonne is offline   Reply With Quote
Old 08-03-2007, 07:23 PM   #65
Senior Member
Posts like a Corvette
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default

Actually, they are pretty much in the same shape they were when I bought them...that picture is just a bit dark.

Terry, if you can still make out the numbers in red Sharpie on the springs, here are the exact Instron test results:

Spring...Uncompressed ht (in)...Spring rate (lb/in)...Seat pressure at 1.800" (lb)
1..............2.153.............................. ..245............................86.4
2..............2.136.............................. ..240............................80.5
3..............2.164.............................. ..238............................86.6
4..............2.136.............................. ..251............................84.5
5..............2.164.............................. ..252............................91.7
6..............2.143.............................. ..260............................89.3
7..............2.146.............................. ..246............................85.1
8..............2.156.............................. ..246............................87.5
9..............2.139.............................. ..242............................82.1
10............2.174............................... .249............................93.1
11............2.142............................... .246............................84.2
12............2.156............................... .249............................88.5

Spring rate:
Avg: 247 +/- 6 lb/in (<3% RSD)
Min, Max: 240 lb/in, 260 lb/in

Seat pressure at 1.800" install height:
Avg: 86.6 lb +/- 3.7 lb (<5% RSD)
Min, Max: 80.5 lb, 93.1 lb

These springs have lost, on average, about 20% of their spring rate and seat pressure versus new specification (313 lb/in and 105 lb, respectively). This is to be expected on valvesprings used some 15k miles or so. They probably won't change much more than this with further use. No single spring is vastly different from the others.

For comparison, a set of stock springs with 30k miles on them tested at 52 lbs average seat pressure at 1.800" install height, for a loss of over 25% from original specification.

I would be interested in some gearheads' opinions on whether the "stronger half" of this batch of springs should go on the intake side or the exhaust side (or if it even matters)...
agrazela is offline   Reply With Quote
Old 08-03-2007, 07:26 PM   #66
Senior Member
Posts like a Camaro
 
Join Date: Oct 2006
Location: montreal canada NEBF07 ONBF07
Posts: 987
Thanks: 0
Thanked 0 Times in 0 Posts
firebuick is on a distinguished road
Default

i would say on the intake because there more lift and duration on the intake side
firebuick is offline   Reply With Quote
Old 08-03-2007, 07:31 PM   #67
Senior Member
Posts like a Corvette
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default

Quote:
Originally Posted by firebuick
i would say on the intake because there more lift and duration on the intake side
I would say the stronger springs should go on the exhaust...because the intake has more lift, and will compress the spring more, I'm thinking putting the lower spring rates on the intake might help even out camshaft wear...
agrazela is offline   Reply With Quote
Old 08-03-2007, 07:41 PM   #68
Senior Member
Posts like a Camaro
 
Join Date: Oct 2006
Location: montreal canada NEBF07 ONBF07
Posts: 987
Thanks: 0
Thanked 0 Times in 0 Posts
firebuick is on a distinguished road
Default

my thinking is that why do you change springs in the first place .because the new cam or the rocker as more lift .so if more lift need stronger spring why not put the stronger springs where there more lift just my 2 cents
firebuick is offline   Reply With Quote
Old 08-03-2007, 07:44 PM   #69
Senior Member
Posts like a Corvette
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default

Quote:
Originally Posted by firebuick
my thinking is that why do you change springs in the first place .because the new cam or the rocker as more lift .so if more lift need stronger spring why not put the stronger springs where there more lift just my 2 cents
Yeah, but they're still stronger than stock...ah well, let'* wait to see what the experts say
agrazela is offline   Reply With Quote
Old 08-03-2007, 08:17 PM   #70
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

I think either way it will be more than enough to take care of valve float. It'* not like it has a crazy */c ramp rate or anything.

I would throw them on the intake if anything though since it weighs more.
95naSTA is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
windshield washer fluid pump motors leak billha 1992-1999 5 09-04-2004 05:20 PM
Doors Open: General Motors Open House Jim W Lounge 23 08-05-2004 05:05 PM
HELP - Any differences between motors??? johnzz4 General GM Chat 17 05-09-2004 02:41 AM
Demo motors? LowLyfe83 General GM Chat 9 04-27-2004 01:12 AM
Motors on Ebay. Roadrash187 General GM Chat 9 10-31-2003 08:05 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:24 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.