turbobusa69 said:
I've ran the 26120 down close to coil bind. But with hyd lobes and the lift is theoretical because of the bleed down. PAC 1203 has a much higher rate and works well in hyd rollers with lift up around .600
Spring recommendation for GN1s
- Thread starter jpwalt1987
- Start date
I've ran the 26120 down close to coil bind. But with hyd lobes and the lift is theoretical because of the bleed down. PAC 1203 has a much higher rate and works well in hyd rollers with lift up around .600
FWIW, I've been using the CompCams 26926 spring, with 885 lifters, and .105" wall pushrods (or thicker) on both iron heads and aluminum heads for a few years now with great success. They're not a drop-in spring for either head though. You'll need to either send them (heads) for some machining, or call Goodson (like I did) and buy a couple tools.
K.
K.
I'm skeptical that the valve springs are the only suspect in a "breaking up" above a certain RPM issues stated here. I'm not trying to diverge from topic, which is valve springs. The combos and part number given in this thread are good info, however, I had a break up /stumble at higher RPM were the car would lay over and refuse to find any higher rpm. I found it to be a weak/bad coil pack. I changed the coil pack and away I went it went from shaking at 4200 to a clean 6200 in short order. I wished better approaches to diagnosing a breakup, stumble issue at higher RPMs were more clear.
The issuse on busa69's car was ruled out. everything under the sun was changed out from my car and it made no difference. John's problem started after the freshened up the motor and changed from a flat tappet cam to this new roller cam. When i mean everything was checked i mean everything. coil/module, scoped the crank and cam sensor, checked all grounds. chip, car pulled like a mofo till 5350-5400 then the KR would nuts with race gas or alky. Used a wideband on the dyno and AFR's perfect. ALso the boost could be anywhere from 18-28 psi and it made no diffrence. The problem would start sooner with the hight boost.
jpwalt1987
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- Nov 9, 2003
SloGN said:
I may have missed it , but what lifters are you running? I had this problem with some morels. I just put the car back together with some comp 885s and .116 wall pushrods. It's a 218/218 cam. Haven't driven it yet though.
Since this is about valve springs...does anyone know the specs on the upgrade Hyd. Roller Springs that come with the Champion Aluminum Heads. The description states that they are behive springs but no specs. I did not see them mentioned is this thread. Here is a link to FT website.
Springs for Hyd. Roller Cam
Springs for Hyd. Roller Cam
turbobusa69
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- Sep 8, 2005
tonysmach, i have the kit from FT, the springs are PAC, mike from FT says the ones i have are about the strongest single beehive available from PAC, there was one a few pounds stronger but isnt one he usually sells. the ones i have are the ones he sells alot of, they came up to 130lbs seat pressure and install height was under 1.72. the open pressure with a 530 lift cam was just about 300lbs. but this set up was with his retainers, the locks he sent which were -.050. so with a zero keepers your seat pressure would be way less due to your install height would be 050 taller.
turbobusa69
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- Sep 8, 2005
well i have the K motion 750's with standard retainers and +060 locks and thanks to mike D for assembling them. pressures are about the same at seat(130ish) and open 530 lift is now 385 range. will try and finish motor this weekend and hopefully see if its resolved. hopefully richards shop will be available this weekend and sloGN will be done playing with golf balls
turbobusa69
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- Sep 8, 2005
well i have the K motion 750's with standard retainers and +060 locks and thanks to mike D for assembling them. pressures are about the same at seat(130ish) and open 530 lift is now 385 range. will try and finish motor this weekend and hopefully see if its resolved. hopefully richards shop will be available this weekend and sloGN will be done playing with golf balls
going to play a round of golf sat morning. T-time is 10:15
vacuum 6
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- Jan 6, 2006
So Jeremy have you drove the car yet?
jpwalt1987
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- Nov 9, 2003
I have but I have had some issues with blowing off an intercooler pipe and really haven't gotten to make a clean pull. I'll let you know what I find and how it pulls.
turbobusa69
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- Sep 8, 2005
well motor is back in and running great. made a pass on the street, 5800+ no issues or banging. i have the morel lifters and the k motion springs and all seems fine now headed to richard clarks dyno asap again to final tune. so for those following this thread, be cautious with the bee hive springs on your roller cam setup. mine didnt like 130lbs seat and 300lbs open pressures they have!!!
headed to richard clarks dyno asap again to final tune. so for those following this thread, be cautious with the bee hive springs on your roller cam setup. mine didnt like 130lbs seat and 300lbs open pressures they have!!!
jpwalt1987
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- Nov 9, 2003
turbobusa69 said:well motor is back in and running great. made a pass on the street, 5800+ no issues or banging. i have the morel lifters and the k motion springs and all seems fine now
Good to know. I will more than likely get a chance to make a couple blasts to see if mine will pull the rpm it should this weekend. I changed to comp 885 lifters. I'll update also.
jpwalt1987
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- Nov 9, 2003
Well I got a chance to make a couple pulls on the back roads. Disappointed to say the least. My valve train noise has been a lot less with the comp885 lifters and smith brothers pushrods. However at 5500 rpm it goes bat$hit crazy. Knock detector goes off and motor starts to feel erratic. This is on only 20-21 psi of boost and 19* timing and spraying alky !!! I really don't see how it could be real knock showing up either. I have to think that the valves are floating now. The springs should be enough but I still haven't verified pressures. They spec at 141@ 1.80 on the seat and 424@ 1.250. That ought to be plenty of spring. WTF??
I tried to upload another screen shot but it wouldnt do. It was way worse than this one.
I tried to upload another screen shot but it wouldnt do. It was way worse than this one.
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jpwalt1987
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RmvBfrFlght
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- Sep 28, 2007
Pull the spark plugs out and check them for signs of detonation. Can see what to look for at this link:
http://dynamicefi.com/SparkPlug.php
Note that the first three pictures that show the peppering are from a SBC. While the last two are from a TB running open loop.
RemoveBeforeFlight
http://dynamicefi.com/SparkPlug.php
Note that the first three pictures that show the peppering are from a SBC. While the last two are from a TB running open loop.
RemoveBeforeFlight
