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

[Lester]

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 at 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 at autox.team.net <mailto: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 <mailto: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> [mailto:bugeye at yahoogroups.com <mailto: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 <mailto: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 <mailto:spridgets at autox.team.net>> wrote:
>>> 
>>> hi guys,
>>> 
>>> With a newly rebuilt 1380 what compression numbers should I expect?
>>> 
>>> Thanks,
>>> 
>>> Lester
>>> 
>>> ------------------------
>>> 
>>> spridgets at autox.team.net <mailto:spridgets at autox.team.net>
>>> 
>>> Donate: http://www.team.net/donate.html <http://www.team.net/donate.html>
>>> Suggested annual donation: $12.75
>>> 
>>> Archive: http://www.team.net/pipermail/spridgets <http://www.team.net/pipermail/spridgets>  http://autox.team.net/archive <http://autox.team.net/archive>
>>> 
>>> Unsubscribe/Manage: http://autox.team.net/mailman/options/spridgets/weslake1330@gmail.com <http://autox.team.net/mailman/options/spridgets/weslake1330@gmail.com>
>>  
>> __._,_.___
>> Posted by: JMFangio <oldsaabguy at comcast.net <mailto:oldsaabguy at comcast.net>> 
>> Reply via web post <https://groups.yahoo.com/neo/groups/bugeye/conversations/messages/45168;_ylc=X3oDMTJxZmVnZzc3BF9TAzk3MzU5NzE0BGdycElkAzI2NzQ2NDAEZ3Jwc3BJZAMxNzA2MDM0NDQ2BG1zZ0lkAzQ1MTY4BHNlYwNmdHIEc2xrA3JwbHkEc3RpbWUDMTU5MjIzMzkxNA--?act=reply&messageNum=45168>	
>> •
>> 
>> Reply to sender  <mailto:oldsaabguy at comcast.net?subject=Re%3A%20%5BSpridgets%5D%20Go%20fast%20engine%20compression%20help>	
>> •
>> 
>> Reply to group  <mailto:bugeye at yahoogroups.com?subject=Re%3A%20%5BSpridgets%5D%20Go%20fast%20engine%20compression%20help>	
>> •
>> 
>> Start a New Topic <https://groups.yahoo.com/neo/groups/bugeye/conversations/newtopic;_ylc=X3oDMTJlM2FhdmI4BF9TAzk3MzU5NzE0BGdycElkAzI2NzQ2NDAEZ3Jwc3BJZAMxNzA2MDM0NDQ2BHNlYwNmdHIEc2xrA250cGMEc3RpbWUDMTU5MjIzMzkxNA-->	
>> •
>> 
>> Messages in this topic <https://groups.yahoo.com/neo/groups/bugeye/conversations/topics/45168;_ylc=X3oDMTM2bDRicWZ1BF9TAzk3MzU5NzE0BGdycElkAzI2NzQ2NDAEZ3Jwc3BJZAMxNzA2MDM0NDQ2BG1zZ0lkAzQ1MTY4BHNlYwNmdHIEc2xrA3Z0cGMEc3RpbWUDMTU5MjIzMzkxNAR0cGNJZAM0NTE2OA--> (1) 
>> 
>> If you wish to unsubscribe from the Austin Healey Bugeye Frogeye Sprite Club, please send a blank email to:  bugeye-unsubscribe at yahoogroups.com <mailto:bugeye-unsubscribe at 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/ <http://groups.yahoo.com/group/bugeye/> and change your subscription to "Web Only" and you will not receive any emails.
>> 
>> VISIT YOUR GROUP <https://groups.yahoo.com/neo/groups/bugeye/info;_ylc=X3oDMTJlN3Y0cXFoBF9TAzk3MzU5NzE0BGdycElkAzI2NzQ2NDAEZ3Jwc3BJZAMxNzA2MDM0NDQ2BHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTU5MjIzMzkxNA-->
>>  <https://groups.yahoo.com/neo;_ylc=X3oDMTJkbWExY3YzBF9TAzk3NDc2NTkwBGdycElkAzI2NzQ2NDAEZ3Jwc3BJZAMxNzA2MDM0NDQ2BHNlYwNmdHIEc2xrA2dmcARzdGltZQMxNTkyMjMzOTE0>
>> • Privacy <https://info.yahoo.com/privacy/us/yahoo/groups/details.html> • Unsubscribe <mailto:bugeye-unsubscribe at yahoogroups.com?subject=Unsubscribe> • Terms of Use <https://info.yahoo.com/legal/us/yahoo/utos/terms/>
>> 
>> 
>> .
>> 
>> 
>> __,_._,___
> 
> ------------------------
> 
> spridgets at autox.team.net <mailto:spridgets at autox.team.net>
> 
> Donate: http://www.team.net/donate.html <http://www.team.net/donate.html>
> Suggested annual donation: $12.75
> 
> Archive: http://www.team.net/pipermail/spridgets <http://www.team.net/pipermail/spridgets>  http://autox.team.net/archive <http://autox.team.net/archive>
> 
> Unsubscribe/Manage: http://autox.team.net/mailman/options/spridgets/weslake1330@gmail.com <http://autox.team.net/mailman/options/spridgets/weslake1330@gmail.com>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/spridgets/attachments/20200620/f07afd1d/attachment.htm>