355 (LE2 head/LE1.5 cam) valve float solution found. Dyno graph inside
05-05-2008, 05:40 PM
#21
The lobes in question in this thread are the 3192 and it's use in a street application is wreckless causing the issues this guy had. Look it up in Comp's catalogue.
Actually it looks to me like the lobes you are using are more aggessive than the ones in my car, judging by the fact you have more lift with less duration and by comparing advertized, .050 and .200 duration numbers.
A little more history may help you.
http://camaroz28.com/forums/showthread.php?t=592005
Actually it looks to me like the lobes you are using are more aggessive than the ones in my car, judging by the fact you have more lift with less duration and by comparing advertized, .050 and .200 duration numbers.
A little more history may help you.
http://camaroz28.com/forums/showthread.php?t=592005
05-05-2008, 05:59 PM
#22
[QUOTE=96capricemgr;9302523]The lobes in question in this thread are the 3192 and it's use in a street application is wreckless causing the issues this guy had. Look it up in Comp's catalogue.
Dwayne
are you refering to XFI or the LE cam this threads author has?
Dwayne
are you refering to XFI or the LE cam this threads author has?
05-05-2008, 06:10 PM
#23
[QUOTE=******;9302663] BOTH how do you think I can get 15K out of a set of 918s when some of the LE stuff destroys them in 2K? Milder lobes are appropriate for the street, they know I drive the hell out of my car and set me up for long term reliability, seems to still make power.
05-05-2008, 06:19 PM
#24
For those interested the Manley 221428 beehive spring has the same coil bind dimension as the Comp Cam 918. So ****** was right on in installing them at the same height. In fact dimension wise they are a direct replacement for the 918 springs.
05-05-2008, 06:21 PM
#25
well I guess time will tell on how long my 918's will last....
Over 3000 miles now and a dozen runs at the track and still holding at high RPM's. Granted I don't hit RPM's higher than 5k for 90% of my driving I would hope to see more than 15,000 miles from the 918's
I would bet premature spring failure in many cases is due to setting them up with a lower than spec installed height.
Over 3000 miles now and a dozen runs at the track and still holding at high RPM's. Granted I don't hit RPM's higher than 5k for 90% of my driving I would hope to see more than 15,000 miles from the 918's
I would bet premature spring failure in many cases is due to setting them up with a lower than spec installed height.
05-05-2008, 07:08 PM
#27
When the float occured the AFGS would fall off while the RPM tried to continue to climb. I saw this on my TTS datamaster.
It has alway been my understanding that (so called reccomeded) numbers like 1.8 or 1.775 are used as points of reference or guides to convey pressure specs. I would think coil bind is the vital thing to consider when setting install height. I am still ~.070" above coil bind and for a beehive that is quite a bit on the safe side. If I am wrong then someone chime in.
My lift is barely over .600" gross on both sides BTW.
There is a chance that the 1218's when they were new were doing a decent job, but i cant be sure. Theres a chance the new 918's or the 1518's might be able to do, who knows. I wanted to avoid just throwing big killer dual coils on if at all possible, the Manley beehives seem like a good compromise and have proven to solve the float problem as shown in the chart.
My car is only a weekend fun car, not a daily driver. I will moitor the spring pressures every 6 months or so. Hell it only takes 30 minutes to check four cylinders with the tool. No big deal there.
Those springs, like the 918's and clones, want a installed height of 1.8", not 1.7xx"
Glad to hear they solved your problem of float but with the lower installed height...the open and seat pressure is higher than spec. This may shorten their life and bring you closer to coil bind pending the lift of your cam.
Glad to hear they solved your problem of float but with the lower installed height...the open and seat pressure is higher than spec. This may shorten their life and bring you closer to coil bind pending the lift of your cam.
My lift is barely over .600" gross on both sides BTW.
There is a chance that the 1218's when they were new were doing a decent job, but i cant be sure. Theres a chance the new 918's or the 1518's might be able to do, who knows. I wanted to avoid just throwing big killer dual coils on if at all possible, the Manley beehives seem like a good compromise and have proven to solve the float problem as shown in the chart.
My car is only a weekend fun car, not a daily driver. I will moitor the spring pressures every 6 months or so. Hell it only takes 30 minutes to check four cylinders with the tool. No big deal there.
Last edited by wrd1972; 05-05-2008 at 07:24 PM.
05-05-2008, 08:24 PM
#29
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Nice numbers! Mine was a bit soft around 1500 RPMs compared to stock. Installing a 58mm TB and opening up the intake helped dramatically. I went from a stock TB though. An MSD D-6 made a big difference also... and now I have to good rev limiter.
CC 3192 - dude they are some aggressive lopes. My LE1 Emissions cam aren't quite as aggressive (same duration at .050, less at .200 and less lift). I now have 4k on my motor and no valve float problems... yet anyways.
Very good numbers though.
CC 3192 - dude they are some aggressive lopes. My LE1 Emissions cam aren't quite as aggressive (same duration at .050, less at .200 and less lift). I now have 4k on my motor and no valve float problems... yet anyways.
Very good numbers though.
05-05-2008, 08:34 PM
#31
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No, I actually put it on to help get through NJ emission this past Jan. It just happened to help low RPM drivability quite a bit. I doubt it made a significant difference in pk HP. The only thing I added after the dyno tuning (that would effect power) was replace the stock air box with an LPE CAI.
05-06-2008, 09:27 PM
#33
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Thanks - I'm very happy with it. My next project is a 95 t-top car I just picked up. It has a new 383 A4 LE3 set up. It's purple (factory color) and my wife decided that she wants to drive it. I'll be ordering another LE1 Emissions cam tomorrow from Lloyd. The LE3 cam is way to radical for her. It should be a great driver with the baby cam in it.
