Jump to content

Unblown R2!


mfg

Recommended Posts

Without the supercharger functioning, an R2 Avanti engine will make ----?---- less power than an R1 Avanti engine......1) 5%.........2) 10%.........3) 15%....or......4) 20% less

Link to comment
Share on other sites

An R2 makes 18% more than an R1 or an R1 makes 15% less than an R2, so I will say 20% less for my answer due to the R2 having a lower compression ratio than an R1. 

Link to comment
Share on other sites

4 hours ago, mfg said:

All good thoughts, however, the correct answer is #2...10%!

Ys, I see that.  I misread the question.  I was giving the amount lost from an R2, not the amount less than an R1. 

Link to comment
Share on other sites

10% makes no sense! That is a drop of 24hp from an R1. So you are saying an unblown R2 generates only 216 hp whereas a non R engine with lower compression, milder cam, and weaker valve springs is rated at 225. Where did this 10% information come from?

 

 

Edited by 64studeavanti
Link to comment
Share on other sites

8 hours ago, 64studeavanti said:

10% makes no sense! That is a drop of 24hp from an R1. So you are saying an unblown R2 generates only 216 hp whereas a non R engine with lower compression, milder cam, and weaker valve springs is rated at 225. Where did this 10% information come from?

 

 

It's all about the compression ratio difference between the R1 and the R2 engines, the ignition timing which would be, at that point, way off, and a carb set up considerably 'richer', to be compatible with blower boost.....A carb that WILL WORK on an R2 with a disconnected supercharger,....but not very efficiently or effectively.

Link to comment
Share on other sites

Once again, not to be a nag, but how was this measured. The compression on R2 is higher than a non R engine. I doubt seriously if the carb would make much difference as there is not much boost at the lower rpms. The centrifigual timing curve on R2 dist may make a little difference.  But i still cannot believe that just removing the S/C would produce less hp than a non R engine. 

 

Do you have any dyno runs or anything else to support this? Is this like most Studebaker lore and just anecdotal?

Link to comment
Share on other sites

9 minutes ago, 64studeavanti said:

Once again, not to be a nag, but how was this measured. The compression on R2 is higher than a non R engine. I doubt seriously if the carb would make much difference as there is not much boost at the lower rpms. The centrifigual timing curve on R2 dist may make a little difference.  But i still cannot believe that just removing the S/C would produce less hp than a non R engine. 

 

Do you have any dyno runs or anything else to support this? Is this like most Studebaker lore and just anecdotal?

I'll get back to you with the source as soon as I can.

Your comment about the carb not mattering too much....believe me you are wrong!.....I once tried to run an R2 Avanti (with functioning supercharger) using a carb from a R1 Avanti engine........WHAT A JOKE!..........It was like I was flooring the throttle pedal, then letting off,...and I wasn't moving the pedal at all!

 

Link to comment
Share on other sites

  • 3 weeks later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...