Dave addressed most of your questions, I think. A few additional tidbits:
25-30 lbs oil pressure at freeway speed would be rather low even warm
with 10/30 (I use 10/40 and usually show 50-70 at freeway speeds). What
does it show at hot idle? At idle 25 would be fine. Do you have any idea
of the mileage on this engine?
The R&T 1968 road test shows 17.6mph/1000rpm. This was with Dunlop 5.60 x
14 tires. The speedometer correction factor was .986 (FWIW). Your tach is
electronic. I am not sure if there is any
adjustment.pppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp
pppppp
[Sorry. My cat just "p'ed" all over my keyboard!]
Anyway, hope this helps.
>>Listers,
>>
>>Yesterday I bought a 1968 MGB for my birthday. The car is in fair shape
>>overall but has a few issues that lead to a few questions...
>>
>>First the good news, it has prefect compression across all cylinders ~160,
>>little rust, and is very original... Note: I will be replacing all hoses
>>ASAP, already have them, safety fast!!!
>>
>>Now the questions:
>>
>>1) What size tires did a 68B with disk wheels have? Any recommendations?
>>2) The speedometer surges. At all speeds the needle jumps within a 10-15
>MPH
>>range and bounces back to what appears to be the true speed. Does the cable
>>need a good lube? Bad gauge?
>>3) The oil pressure was good but the gauge seems to stick some. Also, does
>>oil viscosity play a role in oil pressure? As I drove, two hour drive home,
>>the pressure dropped. After one hour it was around 25-30#. The current oil
>>in the sump is 10W-30 NOT 20W-50 as most would run.
>>4) RPMs seem high. At 70 MPH what should the RPMs be? Also, how do I
>>diagnose the RPM gauge?
>>
>>Thanks in advance...
>>
>>
>>Frank Phillips
>>'68B
>>'69B basket case
>>Email: fwp@ufl.edu
>>
>>
>>
>
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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