×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Diesel vs Gas Engines

Diesel vs Gas Engines

Diesel vs Gas Engines

(OP)
Just a general curiosity question. In comparing a diesel to a spark ignition engine, how does valve timing ,valve lift and cam duration compare? Assume two similar displacement engines, both naturally aspirated four strokes.

RE: Diesel vs Gas Engines

where are you going to find a naturally aspirated diesel these days?

RE: Diesel vs Gas Engines

Durations are a bit less and acceleration rates are higher.   The close proximity of valves to pistons usually results in the valves chasing the piston down the bore.

RE: Diesel vs Gas Engines

"where are you going to find a naturally aspirated diesel these days?"

many places,  almost all small engines <25-50 Hp

RE: Diesel vs Gas Engines

Yes, that's true, but I'm guessing that's not the sort of engine comparison he was after.  (my assumption was that he's looking for automotive-like applications)

RE: Diesel vs Gas Engines


I figured that too, but I just felt I'd mention it. ;)

RE: Diesel vs Gas Engines

(OP)
Yes, automotive applications. A comparison between valve timing on the Olds "diesel" and it's gas counterpart would be most interesting.

RE: Diesel vs Gas Engines

If I remember right the Olds diesel is NA

RE: Diesel vs Gas Engines

For sure, you won't see much, if any, valve overlap/valve opening at TDC exhaust in high performance automotive diesels................Tony

Tony Athens
http://www.sbmar.com

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources