OttoB
Well-known member
- Joined
- Aug 2, 2006
Gasoline EGR is for better fuel economy, less oxygen needs more volumetric efficiency, and that means lower pumping losses.
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Fred Gwynne, ya gotta start your own thread for those questions, we don't do threadjacking here.
I have a few real beginner questions for you folks. Is there a difference between shaving, skimming and decking? Is one for the head while the other is for the block?
Also, if you remove material from the head that means that the valves will now be closer to each piston. If you use a high lift cam such as a "k" cam then the valves may collide with the pistons if too much metal is taken off of the head. Is that correct?
What exactly does shimming mean? Are the valves or is the cam shimmed? Is the idea there to keep the valves from hitting the piston?
Thanks for your help.
Fred Gwynne, ya gotta start your own thread for those questions, we don't do threadjacking here.
Hessam, what car/engine combo are you talking about? A lot of people have thrown opinions in here, maybe they know what you have, but you haven't stated if its a factory turbo motor, a +T or NA, that makes a huge difference in the answers you will get.
I apologize for what seemed, to you and possibly others, to be my attempt to threadjack. I had assumed that my questions were directly related to the title of this thread but apparently they are not.
I have a few real beginner questions for you folks. Is there a difference between shaving, skimming and decking? Is one for the head while the other is for the block?
Also, if you remove material from the head that means that the valves will now be closer to each piston. If you use a high lift cam such as a "k" cam then the valves may collide with the pistons if too much metal is taken off of the head. Is that correct?
What exactly does shimming mean? Are the valves or is the cam shimmed? Is the idea there to keep the valves from hitting the piston?
Thanks for your help.
You're fine. Thread derailment is par for the course here.
"Deck" usually refers to material being machined from the block deck, but it also get's thrown around when talking about machining a head to reduce the chamber volume or to clean it up.
"Shaving" refers to just the head.
Running an aftermarket camshaft will usually result in the engine becoming an interference engine. A large percentage of engines are interference by design, I don't worry about it at all.
"Shimming" is setting the valve clearance using valve shims.
In for a penny, in for a pound. :google:
The reality is, skimming is minor compared to what the Swedes and Norwegians do.
Here is a Norwegian thread about porting the 530 with bigger valves.
I'm pretty sure somewhere in this one is a guy relocated the head 3 mm to the exhaust side to fit bigger valves.
http://forum.vccn.no/showthread.php?36369-Porting-av-530-398-160-topp!/page8
You can google translate it, or just scroll through the pictures.
Let's not get into perceived absolutes.You're fine. Thread derailment is par for the course here.
"Deck" usually refers to material being machined from the block deck, but it also get's thrown around when talking about machining a head to reduce the chamber volume or to clean it up.
"Shaving" refers to just the head.
Running an aftermarket camshaft will usually result in the engine becoming an interference engine. A large percentage of engines are interference by design, I don't worry about it at all.
"Shimming" is setting the valve clearance using valve shims.
From the Swedish site. What is comb?
". My suction I run a relatively gentle comb on, and has 12.2: 1 in compression, where even the dynamic mandrel is higher than the engine had geometrically original. does not knock on mine before I go smoothly over 40 ? on torque peak, while max torque is picked up at just over 30 ?, ergo little point to pull on more ignition if it both slows down the effect and makes bank."
Gentle comb =mild cam?
Screw online translators...they can't do car stuff or normal 'snack'.They're too proper and don't know car parts names......gimme the direct thing copy paste or link.. Somewhere up above there was link to Norski Volvo owners club but that's close enough to Swedish, just sounds like they come from the Ozarks
John,
You were right about it being from the web site posted on page one. I went thru all 38 pages translating probably 70% of those posts.
Funny to see them crack on politicians and beat each other up too. Peak.. I figure there is some slang just like we use that doesn't translate.
http://forum.vccn.no/showthread.php?36369-Porting-av-530-398-160-topp!/page36
this link is to the page from which the pics above were sniped.
It is Norwegian, I'm a memeber---by invite from the Big Cheese Head Moderator..If you were tanslanting that Norsk using Swedish it'll come out even lousier... I'll be back later and show you the BEST translator...gotta cook dinner.
But can you find that particular bit you posted oilier?
"Mooleegens "Munkey see-a munkey du" Sum de-a fleste-a i Rub & Doopleecete-a brunsjee... fee FET et in purt sum ir stur nuk teel ? f?de-a fenteelfindooet oopp teel L/D 0.25 feel g? bedre-a inn dee ur?rte-a ooreeginele-a sum ikke-a gj?r det. Grefer mun st?rre-a inn det igjee oog hfertffell hfees mun ikke-a kj?rer mer l?fft inn L/D 0.25 s? her mun furtsett ikke-a nue-a mer fl?de-a, bere-a in letere-a purt utee nue-a s?rleeg hesteeghet, iller mun her i preksees gjurt 530'n oom teel in 531...
Flere-a koonder f?r mun seffff ef ? ?ke-a ereelet oopp deet et tuppee fekteesk fl?der nuk teel et det ir fenteelfindooet sum blur begrenseenga, furdee det foonker bedre-a inn det kleess ooreeginele-a hfur det ikke-a ir fenteelfindooet sum ir truppa. Koondee merker et det ir furskjell i puseetif retneeng kuntra ooreeginel oog unbeffeler s? denne-a jubbee teel neste-a munn sum loorer
Skel det foonke-a inda bedre-a innenffur elffebet-l?fft kun mun lege-a gener?s beck-coot p? fenteelene-a oog gj?re-a setefeenkelee nue-a smelere-a s? innerdeeun p? setefeenkelee ?ker, feks med in feenkel ikstra i seteeennsetsee, fur ? flytte-a fenteelfindooet lengre-a ut s? dette-a blur st?rre-a fur ithfert l?fft... Rydder mun s? lett oopp i brennkemmeret oog gj?r det mer symmetreesk ela bedre-a-brennende-a FEG 2f tupper, s? blur det derteel oogs? it inda bedre-a resooltet, ikke-a bere-a furdee det semteedig fl?der nue-a bedre-a, mee furdee mun utnytter det mun her f?tt inn bedre-a oogs?. Feks. ir dee ooreeginele-a Fulfu l?sneengee med ubrookte-a sqooeesh-fleter i tuppee sum steekker ut oofer grupa i stempelet in durekte-a ?delegende-a effff?re-a, ift. kun mun f? "coostumstempeler" sum gjenspeeeler sqooeesh-fletene-a, mee det igjee ir ikke-a in beellig effff?re-a oog nue-a mun koon helst fureter seg p? it leett mer seree?st NA-bygg hfur mun oogs? feel hulde-a kemmeret nue-a mer kumpekt (p? it fees ir ju ? besere-a seg p? in 530 leett skeefebum i utgungspoonktet hfees ikke-a regler oosf furbyr feks. 16f), oog da ir brennkemmer mud. in bedre-a l?sneeng i de-a eller flestes teelffeller.