Difference between Hydraulic and Solid Cam? - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• Difference between Hydraulic and Solid Cam? by silentdub on 19 Jul, 2011 11:10
• I know the difference actually, but I guess my question would be, Is there a reason to use one and not the other?
  
  All of the previous motors I built were all hydraulic, especially the older V8's.
  
  
  
  Is there a reason for one verse the other on a 1.6 N/A? Other than being quieter.
• #1 by R.O.R-2.0 on 19 Jul, 2011 12:36
• Quote from: silentdub on 19 Jul, 2011 11:10

  I know the difference actually, but I guess my question would be, Is there a reason to use one and not the other?
  
  All of the previous motors I built were all hydraulic, especially the older V8's.
  
  
  
  Is there a reason for one verse the other on a 1.6 N/A? Other than being quieter.
  

  
  well, solid lifters need the valves adjusted, hydro lifters dont need adjustment. and you can turn a few more rpms using a solid lifter head on a gasser engine. our engines dont care, the head is not the limiting factor for rpms, the pump is..
• #2 by CRSMP5 on 19 Jul, 2011 20:31
• the lobe is different... solid lifter much much longer.. and bigger diameter too..
• #3 by rabbitman on 19 Jul, 2011 20:34
• Quote from: CRSMP5 on 19 Jul, 2011 20:31

  the lobe is different... solid lifter much much longer.. and bigger diameter too..
  

  
  I believe the valve lift is the same though.
• #4 by CRSMP5 on 19 Jul, 2011 20:38
• LOL.. hydro lifter is "longer" so i bet it locks up with non hydro cam first..
  
  people regrind solid cams for performance hydro cams due to the extra metal.. will not work.. and a hydro cam in a non hydro head would require some serious shims to make up the differance..
  
  if you broke your hydro cam.. and are looking for a solution.. you can send delta cams in tacoma washington a solid cam to convert into hydro.. 15 years ago it was a 100$ solution..
• #5 by silentdub on 20 Jul, 2011 08:52
• Quote from: CRSMP5 on 19 Jul, 2011 20:38

  LOL.. hydro lifter is "longer" so i bet it locks up with non hydro cam first..
  
  people regrind solid cams for performance hydro cams due to the extra metal.. will not work.. and a hydro cam in a non hydro head would require some serious shims to make up the differance..
  
  if you broke your hydro cam.. and are looking for a solution.. you can send delta cams in tacoma washington a solid cam to convert into hydro.. 15 years ago it was a 100$ solution..
  

  
  
  Thanks for the info. I don't need a new cam or want to change anything, I just wanted to know the difference on these little guys.
  
  I think most SB V8's go with hydro unless it is a serious race engine. Well, most are roller now anyway.
  
  I did notice that when I pulled the lifters, a few of them were in 2 pieces. The top part came away from the skirts.
• #6 by Mark(The Miser)UK on 20 Jul, 2011 09:08
• Quote from: silentdub on 20 Jul, 2011 08:52

  Quote from: CRSMP5 on 19 Jul, 2011 20:38

  LOL.. hydro lifter is "longer" so i bet it locks up with non hydro cam first..
  
  people regrind solid cams for performance hydro cams due to the extra metal.. will not work.. and a hydro cam in a non hydro head would require some serious shims to make up the differance..
  
  if you broke your hydro cam.. and are looking for a solution.. you can send delta cams in tacoma washington a solid cam to convert into hydro.. 15 years ago it was a 100$ solution..
  

  
  
  Thanks for the info. I don't need a new cam or want to change anything, I just wanted to know the difference on these little guys.
  
  I think most SB V8's go with hydro unless it is a serious race engine. Well, most are roller now anyway.
  
  I did notice that when I pulled the lifters, a few of them were in 2 pieces. The top part came away from the skirts.
  

  
  They all do that! That is the bit held under oil vaccuum that you change to alter valve gap, and is called a shim. Absent in the hydraulic version
• #7 by silentdub on 20 Jul, 2011 09:13
• Gotcha, yeah, its not really a lifter in the traditional sense.
• #8 by Mark(The Miser)UK on 20 Jul, 2011 09:53
• Quote from: silentdub on 20 Jul, 2011 09:13

  Gotcha, yeah, its not really a lifter in the traditional sense.
  

  Cam follower perhaps.
• #9 by silentdub on 20 Jul, 2011 10:31
• Quote from: Mark(The Miser)UK on 20 Jul, 2011 09:53

  Quote from: silentdub on 20 Jul, 2011 09:13

  Gotcha, yeah, its not really a lifter in the traditional sense.
  

  Cam follower perhaps.
  

  
  
  follower, shim...... I guess I am showing my age when I say lifters, not many motors these days are OHV engines.
• #10 by Mark(The Miser)UK on 20 Jul, 2011 11:27
• Quote from: silentdub on 20 Jul, 2011 10:31

  Quote from: Mark(The Miser)UK on 20 Jul, 2011 09:53

  Quote from: silentdub on 20 Jul, 2011 09:13

  Gotcha, yeah, its not really a lifter in the traditional sense.
  

  Cam follower perhaps.
  

  follower, shim...... I guess I am showing my age when I say lifters, not many motors these days are OHV engines.
  

  
  Rockers, push rods and screw adjusters....
  
  And grease nipples, but that's another story