| turbo69bird |
02-16-2023 03:40 AM |
Quote:
Originally Posted by tjs44
(Post 1614919)
Same cam same CR same CI I dont think any diff in sound on a RA III engine and a RA V engine.Been there done that.JMHO,Tom
|
Tom we were talking about the difference in compression ratio in the sound not necessarily the d port Vs V port . I only used the V and D port because that’s what I had for comparison in my garage in different compressions, and wanted to explain the difference . That the RAV was a higher performance version and higher compression. Yet the D port lower performance engine w low compression sounded the same . In fact most people who hear both side by side idling feel the Turbo car sounds nastier and snottier even though it’s far lower compression , smaller cam , and blows through the turbo which knocks down some decibels. . RAV is a roller cam 650 lift range about a 112 LSA and the d port turbo car is a solid flat tappet in the 550 range 114 LSA.
I’ve built RAIV both ways stroker w low compression and original w high compression and I dint feel there was any dicernable difference in the way they sounded. We are really only taking about 1 point to 1.5 points of compression between the two on those engines if the original is built to 1969 NHRA specs even For a stock eliminator to a drivable on pump gas stroker RAIV. |
