When the engine warms up does lash decrease or increase? IOW if I set the hydraulic adjusters to .001" clearance cold, will it become less or more at operating temp?
When the engine warms up does lash decrease or increase? IOW if I set the hydraulic adjusters to .001" clearance cold, will it become less or more at operating temp?
[SIGPIC][/SIGPIC][FONT=Comic Sans MS]'91 Shadow convertible 2.5 auto, three core RP IC, S60/.48 stg 1, ported two-piece intake/52mm TB, Menegon +1 swirl, 88 turbo cam, Venolias, Crower rods, TU deep sump pan, ported exhaust, 3" from SV to TP, Hughes TC, Peloquin diff, DSS L5 driveshafts, Shelgame cal, Koni struts/shocks. [/FONT]
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
My confusion is about the aluminum head. I know a forged valve expands (lengthens) more than a cast iron head, but it seems like an aluminum head would "grow" more than the valves and increase clearance.
[SIGPIC][/SIGPIC][FONT=Comic Sans MS]'91 Shadow convertible 2.5 auto, three core RP IC, S60/.48 stg 1, ported two-piece intake/52mm TB, Menegon +1 swirl, 88 turbo cam, Venolias, Crower rods, TU deep sump pan, ported exhaust, 3" from SV to TP, Hughes TC, Peloquin diff, DSS L5 driveshafts, Shelgame cal, Koni struts/shocks. [/FONT]
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
I squished the lifters in the vice, put them back in with 2 shims and it STILL held the valves open. Looks like 1 shim is it for these cams with the stock lifters, so the PT's should be able to be used with 3 shims.
I have new news. Found out I was actually running with the cam 1 tooth advanced! I couldn't figure out why at 6700 the engine was dying when with the stock cam the engine pulled to 7000! LOL, well I figured it out!
Soooo, with the cam properly setup I now have 14-15'' of vacuum at idle, but it still seems pretty smooth not much lope at all. Spoolup was decreased, I now don't have full boost until 4500 RPM (stock cam is 4000 RPM full boost), but when I got to 7000 RPM the engine was misfiring and carrying on. This may be in the cal, but honestly I really liked the more lower RPM power the stock cam gave because my setup was built to rev and it still does that OK with the stock cam.
I just want to point out right now that this is an unfair test for this cam. I'm running a G headed 2.2, and with this super low compression (7.4:1) I don't think this cam will be compatable. Also, with the huge plenum/short runner intake I have, the power band from idle-3500 is complete crap, nothing. It wasn't that great with the stock cam, but tolerable.
My advice, this cam will shine in a high flowing 2.5L setup. I honestly wish I would have had this cam when I was running the 2.5L because that setup could have used less low end and more top end for sure. But, a stock compression 2.2/swirl head this cam may still be OK. But it's not for me, or my setup.
Another thought is perhaps trying this cam 4 degree's advanced, wondering if this cam was indeed setup for square tooth and I have it on the round. Since one tooth is 9 degrees, potentially when I had it 1 tooth advanced it may have only been 5 degree's advanced. Now that I backed it off the tooth it's now 4 degree's retarded. I dunno, thats all speculation. But, I really need the stock cam in my setup so I've decided just to switch back. With the low compression I have, a compression test yields 130 across the board on a fresh engine (would be 150+ with a swirl head) with the stock cam. With this cam, I was only pushing 120 PSI compression with the cam 1 tooth advanced, so it was probably less than that even with it set correctly now. I suspect this is the largest part for the misfiring at high RPM's.
The slider S60 cam as sold by MP was never meant to be installed straight up on either sprocket. It must be centerlined to work as designed. According to the MP catalog, the correct centerline for the MP S60 is 112*. Neither the square nor round tooth sprocket will get you to that centerline without the use of offset cam keys.
However, if you measure the centerline of your install and it is only off by a couple of degrees, don't bother to go further. As 2 degrees either way will most likely not be noticeable either in driveability or performance.
Barry
86 Shelby Lancer Prototype
90 Daytona Shelby VNT
91 Spirit R/T
For your questions about SDAC, please contact BadAssPerformance
Are you certain you got your lash adjuster issue sorted out?
[SIGPIC][/SIGPIC][FONT=Comic Sans MS]'91 Shadow convertible 2.5 auto, three core RP IC, S60/.48 stg 1, ported two-piece intake/52mm TB, Menegon +1 swirl, 88 turbo cam, Venolias, Crower rods, TU deep sump pan, ported exhaust, 3" from SV to TP, Hughes TC, Peloquin diff, DSS L5 driveshafts, Shelgame cal, Koni struts/shocks. [/FONT]
If nobody gets around to it by them, Terry Ryan aka Gasketmaster has one, he's going to dyno his van with the stocker and then put the S60 in. Probably be a couple months he said.
Thanks for the info Barry,
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
There was nothing to sort. 2 shims held the valves open even after squishing the lifters down, as soon as I cranked over the engine when oil pressure got to the lifter it lifted them back up. I had no choice but to run 1 shim, it seemed to be fine though. Like I said it didn't spit any rockers out or anything.
simon i need to know whats going on with my cam before monday. i spent forty to ship it to you and if you arent going to get i need to know before monday so i can pay another 50 to have it sent back to me or give me your other address to send it to before i get screwed and its stuck in canada.
So, I finally got around to installing my cam....
I busted out the degree wheel and dial indicator, Installed on a 111 centerline.
(I got really lucky, i eyeballed it to 116 then only had to back off 2 ticks on my adjustable sprocket)
i gotta say..... Wowzers!!
i still have 21 in vac (about the same as with the stocker)
it seems as if hell wants to break loose @ 5000 and im currently only running 10psi...
im using the 061 springs, w/ pt lifters on a big valve 782 head ( 200ish cfm @500)
2.5 litre
ported 2 peice intake
ported exaust mani (tu header looking pretty sitting on the floor....)
3 in exaust 3"swingvalve
---- a 57 trim in stock housing w/ clipped wheel in .63------ (yes i know )
Aluminum flywheel. 6 puck clutch Obx lsd
it sounds the same as the stock cam did.
i didn't notice any more low end slugishness
Last edited by Sloride; 08-04-2008 at 08:11 PM.
What are you using for shims?
Did you get a new billet cam?
I'll also update on my situation. Turns out that my intake guides were worn out bad, about .022'' clearance! This is why I was having the high RPM misfire, the valve was not getting sealed back up because it was wobbling around.
So I got the guides replaced, next thing I know my rod bearings crapped out. Ain't life grand.
ouch.
yeah its a new billet and the washers for the pt lifters were from the pope. i had to create a solid lash adjuster (actually got it to the exact height of a normal adjuster 51.9 mm.... i have 7 more worn out adjusters.... perhaps i should manufacture some-more)
hydraulic cams don't have clearance ramps to gradually take up lash like solid lifter cams. I would be concerned that the hard lifters will wear out your cam prematurely.
[SIGPIC][/SIGPIC][FONT=Comic Sans MS]'91 Shadow convertible 2.5 auto, three core RP IC, S60/.48 stg 1, ported two-piece intake/52mm TB, Menegon +1 swirl, 88 turbo cam, Venolias, Crower rods, TU deep sump pan, ported exhaust, 3" from SV to TP, Hughes TC, Peloquin diff, DSS L5 driveshafts, Shelgame cal, Koni struts/shocks. [/FONT]