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

 To: Weslake1330 Re: [Spridgets] Bugeye/Frogeye Club..... Re: Go fast engine compression help Lester via Spridgets Sat, 20 Jun 2020 18:59:53 -0500 Spridgets , Yahoo Spridget list , Colin Dodds , "\[bugeye\]" mharc@autox.team.net spridgets@autox.team.net <7807AE91-CF07-4281-B24B-24F2514B05F4@comcast.net>
 ```--===============7468916330488265353== --Apple-Mail=_2CAA2BF6-BB10-45D2-8FAD-AA5BB016A11D Content-Transfer-Encoding: quoted-printable charset=utf-8 Ok, that does make sense. Maybe I should ask what a stock 1275 measure = and work from there. Thanks, Lester > On Jun 20, 2020, at 1:35 PM, Weslake1330 = wrote: >=20 > 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 >=20 > On Sat, 20 Jun 2020 at 16:46, Lester Ewing via Spridgets = > Colin, >=20 > 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. >=20 > Lester >=20 >=20 >> On Jun 15, 2020, at 4:36 PM, Colin Dodds >=20 >> Sorry Lester, but Steve=E2=80=99s previous answer was correct =E2=80=93= there are too many variables. How good is the battery, how good is the = starter motor, what=E2=80=99s the tappet gap? The compression ratio = should be calculated by measuring bore and head volumes before the = engine is assembled. It=E2=80=99s impossible to gauge engine = compression from a gauge down the plug hole. All that=E2=80=99s going = to tell you is that they=E2=80=99re 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. >> =20 >> avagoodday >> Colin >> www.SpriteParts.com.au >> =20 >> =20 >> 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 >> =20 >> =20 >> 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? >>=20 >> =20 >> =20 >> Lester >> =20 >> =20 >>=20 >>=20 >> On Jun 15, 2020, at 2:53 AM, Weslake1330 > =20 >> 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? >> =20 >> On Mon, 15 Jun 2020 at 01:16, Lester Ewing via Spridgets = >>>=20 >>> hi guys, >>>=20 >>> With a newly rebuilt 1380 what compression numbers should I expect? >>>=20 >>> Thanks, >>>=20 >>> Lester >>>=20 >>> ------------------------ >>>=20 >>>=20 >>> Donate: http://www.team.net/donate.html = >>> Suggested annual donation: \$12.75 >>>=20 >>> Archive: http://www.team.net/pipermail/spridgets = http://autox.team.net/archive = >>>=20 >>> Unsubscribe/Manage: = http://autox.team.net/mailman/options/spridgets/weslake1330@gmail.com = >> =20 >> __._,_.___ >> Posted by: JMFangio > Reply via web post = =09 >> =E2=80=A2 >>=20 >> Reply to sender=C2=A0 = st%20engine%20compression%20help>=09 >> =E2=80=A2 >>=20 >> Reply to group=C2=A0 = st%20engine%20compression%20help>=09 >> =E2=80=A2 >>=20 >> Start a New Topic = =09 >> =E2=80=A2 >>=20 >> Messages in this topic = (1)=20 >>=20 >> If you wish to unsubscribe from the Austin Healey Bugeye Frogeye = Sprite Club, please send a blank email to: = bugeye-unsubscribe@yahoogroups.com = >> If you no longer want to receive emails, but wish to remain a member = of the group, you may go to the website = http://groups.yahoo.com/group/bugeye/ = and change your subscription to = "Web Only" and you will not receive any emails. >>=20 >> VISIT YOUR GROUP = >> = >> =E2=80=A2 Privacy = =E2=80=A2 = Unsubscribe = Terms of Use >>=20 >>=20 >> . >>=20 >>=20 >> __,_._,___ >=20 > ------------------------ >=20 >=20 > Donate: http://www.team.net/donate.html = > Suggested annual donation: \$12.75 >=20 > Archive: http://www.team.net/pipermail/spridgets = http://autox.team.net/archive = >=20 > Unsubscribe/Manage: = http://autox.team.net/mailman/options/spridgets/weslake1330@gmail.com = --Apple-Mail=_2CAA2BF6-BB10-45D2-8FAD-AA5BB016A11D Content-Transfer-Encoding: quoted-printable charset=utf-8 Ok, that does make sense.  Maybe I should ask what a = stock 1275 measure and work from there.

Thanks,

Lester

On Jun 20, 2020, at 1:35 PM, = Weslake1330 <weslake1330@gmail.com> wrote:

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@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@spriteparts.com.au> wrote:

Sorry = Lester, but Steve=E2=80=99s previous answer was correct =E2=80=93 there = are too many variables.  How good is the battery, how good is the = starter motor, what=E2=80=99s the tappet gap?  The compression = ratio should be calculated by measuring bore and head volumes before the = engine is assembled.  It=E2=80=99s impossible to gauge engine = compression from a gauge down the plug hole.  All that=E2=80=99s = going to tell you is that they=E2=80=99re 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

From: bugeye@yahoogroups.com [mailto:bugeye@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@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@autox.team.net> wrote:

hi guys,

With a newly rebuilt 1380 what compression numbers should I = expect?

Thanks,

Lester

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spridgets@autox.team.net

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Posted by: = JMFangio <oldsaabguy@comcast.net>

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 Current Thread Re: [Spridgets] Bugeye/Frogeye Club..... Re: Go fast engine compression help, Lester Ewing via Spridgets Re: [Spridgets] Bugeye/Frogeye Club..... Re: Go fast engine compression help, Weslake1330 via Spridgets Re: [Spridgets] Bugeye/Frogeye Club..... Re: Go fast engine compression help, Lester via Spridgets <=