Edited my last post
Make a thread offering this service!COMPRESSION COMPRESSION COMPRESSION!!!
Lets say with stock heads your compression was 8:1static with corrected dished pistons. Then you add cams that change the IVC location, this effectively altered your dynamic compression, now your 8:1static is nearly impossible to achieve because of effective compression.
Since you opt for tfs heads, raise your static to 11:1static with the .020" squish distance. Pump her full of air!
I can narrow down the actual static compression for your particular build if you specify all the technical.
Huh? So you ended up with even less power? Something is wrong. Also is it 18* or is it 14* I mean at wot the timing should be be what it is. To give you an idea on 93 pump 10%E I run 15* of timing and it's pretty close. I could back it down a bit.So all the paperwork for the specs on the motor is in my car two hours away at the tuners and I cant remember what everything is. I did make some phone calls today though talked to Greg at MMR he thinks that with my specs and boost that the power output is about right for my build he did want a compression test done and the plug gap checked. That is not what I was expecting as I was expecting power to be around 480ish. Called my tuner to see what my IAT's were at before we did the overdrive crank pulley and he said that he didn't datalog the IAT's but the timing for the pull ranged from 18-14 degrees. When I asked him about the timing on the second pull he admitted that the 425 hp number was not the finall pull and it ended up at 350 hp and he never really did tell what they were. As for the fuel I'm running twin 255's on a return style system.
Im assuming it's 14* for wot and that was just the rangr for the pullHuh? So you ended up with even less power? Something is wrong. Also is it 18* or is it 14* I mean at wot the timing should be be what it is. To give you an idea on 93 pump 10%E I run 15* of timing and it's pretty close. I could back it down a bit.
MMR said that the springs are matched to the cam when theey installed them. Finally talked to the shop that installed the motor after their phone lines weren't working yesterday and he said that they did not check the lash adjustments didn't think there was a reason to which was my thought as well if you have to start double checking their work where do you stop? Then you might as well of done the whole build instead of hiring a professional.What valve springs? What lash adjusters? And did you check the lash?
What? That makes no sense. Lash adjusters just push the rocker arm to the cam and the valve. Valve float is what your describing and that's because the springs can't hold the valve close.I totally agree!
I assisted in a supercharged 5.4l dohc build with a friend. After multiple dyno attempts to extract more power with consecutive bolt ons and such, the power level stayed the same. Puzzeled as to why and very frustrated he decided to pull it all apart. With the highest attention to detail, we discovered the lash adjusters were causing the problem. This is because the valve train is so tight tolerance, the lash adjusters were lifting the valves off the seats at high oil pressure rates (high rpm). Solution was lash the adjusters in. Simple material removal/adding of lasher bottoms was the fix. 600rwhp wasnt enough but now he touches 750rwhp at 4500rpm before the 8 rib belt slings off. Im in process of machining him out a 10rib 10" crank pulley now along with the acc pulleys too.
I didn't have a very good understanding of how a lash adjuster worked before but after doing some reading on it I was wondering if you could clarify on how you check lash adjustment on a uninstalled motor? Don't they need oil pressure on them to see if they are working properly or is the internal spring pressure all that's needed?I know what valve float is...Wichers! Im describing a hydraulic actuator completely extended underload operating a cantilever finger follower with a 1.8ratio... operating a valve.
I can break this down if you guys need it, but lets let the OP investigate other possible issues.