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Technical => Matt Shaff's Engine Shop => Topic started by: wideopen231 on March 30, 2018, 06:23:43 PM

Title: ring package w/vacuum pump
Post by: wideopen231 on March 30, 2018, 06:23:43 PM

Ok got a vacuum pump for car. Looking at swapping oild rings maybe secondary. Current combo is .047 dyke(ss),1/16 total seal and 3/16 oil. Not changing pistons right now so have to work with whats here. Seeing as vacuum pumps power gains are mainly with low tension rings. I am thing low tension oil and maybe swapping gapless second for low drag. Top is kind of dictated due to being cut for dyke rings.

Thoughts and suggestions?

Oh yea cars is just injected 526 Hemi with possible 30% load at times.

Title: Re: ring package w/vacuum pump
Post by: jeff/21 on March 30, 2018, 08:24:36 PM

500 cu in roots blown alky bbc we run gapless for the last three years no vacuum pump dry sump they seem to work better than low tension napier rings we ran before

Title: Re: ring package w/vacuum pump
Post by: masracingtd1167 on April 01, 2018, 10:05:58 AM

Chris I would try it just the way it is with the vac pump ! If you talk to total seal they will tell you to run the Napier ring and if you talk to Bill Miller he will tell you not to ! I would tend to believe Bill Miller ! He helped my son out when he was having piston trouble with his car and the second ring was part of the problem !

Title: Re: ring package w/vacuum pump
Post by: wideopen231 on April 02, 2018, 05:16:14 AM

Bill,

 You have total different experiance with BME than I have. Long story short. Killed one motor,swapped  out,made 4 passes and when pulled engine down found 4 rods cracked at bolt. According to BM I had left the rods torqued in trailer and cold caused oil to turn to catalyst that caused rods to crack.  I do live in NC not that cold here between March and Nov. . My last set of BME.

I'm thinking trying what I have some more and then switch to see if any noticeable difference. As close as I can get to ABA test. Probably will be very small and hard to find on ET slip,but where the fun in just switching and not knowing? As Alan Starr told me once if you don't ;earn something new everyday you wasted that day.

Title: Re: ring package w/vacuum pump
Post by: jeff/21 on April 02, 2018, 07:00:48 AM

 The bbc is in a inboard hydro and with the gapless 2nd ring there was no milky oil and leak down percentage was less, we run 2 or 5 days 5 warm-up then 5 race laps x 2 qualifying and a feature each day
on the dyno we didn't find any difference.