[Spridgets] Bugeye/Frogeye Club..... Re: Go fast engine compression help

[Weslake1330]

If you don't know what the static compression ratio the engine was built
with is, then I don't see how you can know if any given reading is bad.  If
your engine was built with a CR of 7:1 then a reading of 150 is probably
great.  However, if the engine was built with a CR of 11:1 then a reading
of 150 might be disappointing

On Sat, 20 Jun 2020 at 16:46, Lester Ewing via Spridgets <
spridgets at autox.team.net> wrote:

> Colin,
>
> Thanks, I am NOT trying to calculate compression ratio.  I just want a
> rough number.  Is 6 bad is 200 great?  I am inly trying to get a rough idea
> if the compression number I have is reasonable for the engine I have.
> Between 135 and 150 is what I want to know.
>
> Lester
>
>
> On Jun 15, 2020, at 4:36 PM, Colin Dodds <colin at spriteparts.com.au> wrote:
>
> Sorry Lester, but Steve’s previous answer was correct – there are too many
> variables.  How good is the battery, how good is the starter motor, what’s
> the tappet gap?  The compression ratio should be calculated by measuring
> bore and head volumes before the engine is assembled.  It’s impossible to
> gauge engine compression from a gauge down the plug hole.  All that’s going
> to tell you is that they’re all close to the same, which is a good thing.
> With your engine specs, I would expect the compression gauge to read
> between 135 and 150.
>
> avagoodday
> Colin
> www.SpriteParts.com.au <http://www.spriteparts.com.au/>
>
>
> ------------------------------
> *From:* bugeye at yahoogroups.com [mailto:bugeye at yahoogroups.com
> <bugeye at yahoogroups.com>]
> *Sent:* Tuesday, 16 June 2020 1:12 AM
> *To:* Weslake1330
> *Cc:* Spridgets; [bugeye]; Yahoo Spridget list
> *Subject:* Bugeye/Frogeye Club..... Re: [Spridgets] Go fast engine
> compression help
>
>
>
> Well let me put it this way, on a new engine with a street cam is 135psi
>  a good number?  Or should it be closer to 150psi?
>
>
> Lester
>
>
>
>
> On Jun 15, 2020, at 2:53 AM, Weslake1330 <weslake1330 at gmail.com> wrote:
>
> In part it will depend on what compression ratio was used in the first
> place - 9 to 1 or 10.5 to 1 or whatever?
>
> On Mon, 15 Jun 2020 at 01:16, Lester Ewing via Spridgets <
> spridgets at autox.team.net> wrote:
>
>
> hi guys,
>
> With a newly rebuilt 1380 what compression numbers should I expect?
>
> Thanks,
>
> Lester
>
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