Re: Compression check results.
 

L.W. (ßill) ------ III did pass the time by typing:
> It's designed to pump at cranking otherwise the Detroit diesel
> 2-cycle engines would never start.

It does turn, but compression at cranking is +0psi. http://www.kennebell.net
when I put demand on the charger it closes off the bypass and start compressing
air, till then it's more of a slight restriction than anything else.

I can watch the boost/vac gauge and see perfectly normal numbers till the engine
starts seeing load. Idle is about 12 in vac in drive while stopped or 18in while
decelerating by letting off the skinny pedal.

> DougW wrote:
>>
>> It wouldn't. The blower only comes on if there is demand, otherwise it
>> bypasses internally. That and at cranking speed there isn't enough rpm
>> anyway.

Re: Compression check results.
 

L.W. (ßill) ------ III did pass the time by typing:
> It's designed to pump at cranking otherwise the Detroit diesel
> 2-cycle engines would never start.

It does turn, but compression at cranking is +0psi. http://www.kennebell.net
when I put demand on the charger it closes off the bypass and start compressing
air, till then it's more of a slight restriction than anything else.

I can watch the boost/vac gauge and see perfectly normal numbers till the engine
starts seeing load. Idle is about 12 in vac in drive while stopped or 18in while
decelerating by letting off the skinny pedal.

> DougW wrote:
>>
>> It wouldn't. The blower only comes on if there is demand, otherwise it
>> bypasses internally. That and at cranking speed there isn't enough rpm
>> anyway.

Re: Compression check results.
 

L.W. (ßill) ------ III did pass the time by typing:
> It's designed to pump at cranking otherwise the Detroit diesel
> 2-cycle engines would never start.

It does turn, but compression at cranking is +0psi. http://www.kennebell.net
when I put demand on the charger it closes off the bypass and start compressing
air, till then it's more of a slight restriction than anything else.

I can watch the boost/vac gauge and see perfectly normal numbers till the engine
starts seeing load. Idle is about 12 in vac in drive while stopped or 18in while
decelerating by letting off the skinny pedal.

> DougW wrote:
>>
>> It wouldn't. The blower only comes on if there is demand, otherwise it
>> bypasses internally. That and at cranking speed there isn't enough rpm
>> anyway.

Re: Compression check results.
 

I guess I'm just use to the my stock gear driven Detroits, or a
friends half speed 671 http://www.----------.com/32ford.jpg that did not
vary. But I did have an centrifugal that open the pulley to double the
speed: http://www.----------.com/supercharger.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

> It does turn, but compression at cranking is +0psi. http://www.kennebell.net
> when I put demand on the charger it closes off the bypass and start compressing
> air, till then it's more of a slight restriction than anything else.
>
> I can watch the boost/vac gauge and see perfectly normal numbers till the engine
> starts seeing load. Idle is about 12 in vac in drive while stopped or 18in while
> decelerating by letting off the skinny pedal.

Re: Compression check results.
 

I guess I'm just use to the my stock gear driven Detroits, or a
friends half speed 671 http://www.----------.com/32ford.jpg that did not
vary. But I did have an centrifugal that open the pulley to double the
speed: http://www.----------.com/supercharger.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

> It does turn, but compression at cranking is +0psi. http://www.kennebell.net
> when I put demand on the charger it closes off the bypass and start compressing
> air, till then it's more of a slight restriction than anything else.
>
> I can watch the boost/vac gauge and see perfectly normal numbers till the engine
> starts seeing load. Idle is about 12 in vac in drive while stopped or 18in while
> decelerating by letting off the skinny pedal.

Re: Compression check results.
 

I guess I'm just use to the my stock gear driven Detroits, or a
friends half speed 671 http://www.----------.com/32ford.jpg that did not
vary. But I did have an centrifugal that open the pulley to double the
speed: http://www.----------.com/supercharger.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

> It does turn, but compression at cranking is +0psi. http://www.kennebell.net
> when I put demand on the charger it closes off the bypass and start compressing
> air, till then it's more of a slight restriction than anything else.
>
> I can watch the boost/vac gauge and see perfectly normal numbers till the engine
> starts seeing load. Idle is about 12 in vac in drive while stopped or 18in while
> decelerating by letting off the skinny pedal.

Re: Compression check results.
 

I guess I'm just use to the my stock gear driven Detroits, or a
friends half speed 671 http://www.----------.com/32ford.jpg that did not
vary. But I did have an centrifugal that open the pulley to double the
speed: http://www.----------.com/supercharger.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

> It does turn, but compression at cranking is +0psi. http://www.kennebell.net
> when I put demand on the charger it closes off the bypass and start compressing
> air, till then it's more of a slight restriction than anything else.
>
> I can watch the boost/vac gauge and see perfectly normal numbers till the engine
> starts seeing load. Idle is about 12 in vac in drive while stopped or 18in while
> decelerating by letting off the skinny pedal.

Re: Compression check results.
 

Good to know, thanks.

Mike

DougW wrote:
>
> Mike Romain did pass the time by typing:
> > You got a blower on there?
>
> Yep. :)
>
> > Ok, I have no idea what that could do to the compression on cranking.
> > What does it rely on for 'demand'? It could be seeing high vacuum with
> > the throttle plate closed and be spinning up.
>
> Compression at idle/crank should be identical to a normally aspirated
> engine. (hard to type whle slightly buzzed) :D
>
> I foobared and didn't block the throttle open. Next time.
>
> > Meanwhile if you have no ping issues, then you have no issues.
>
> That's what I thought. Just wanted to get a basline and find out
> for sure if there wasn't a big ass leak causing the rough idle.
>
> --
> DougW

Re: Compression check results.
 

Good to know, thanks.

Mike

DougW wrote:
>
> Mike Romain did pass the time by typing:
> > You got a blower on there?
>
> Yep. :)
>
> > Ok, I have no idea what that could do to the compression on cranking.
> > What does it rely on for 'demand'? It could be seeing high vacuum with
> > the throttle plate closed and be spinning up.
>
> Compression at idle/crank should be identical to a normally aspirated
> engine. (hard to type whle slightly buzzed) :D
>
> I foobared and didn't block the throttle open. Next time.
>
> > Meanwhile if you have no ping issues, then you have no issues.
>
> That's what I thought. Just wanted to get a basline and find out
> for sure if there wasn't a big ass leak causing the rough idle.
>
> --
> DougW

Re: Compression check results.
 

Good to know, thanks.

Mike

DougW wrote:
>
> Mike Romain did pass the time by typing:
> > You got a blower on there?
>
> Yep. :)
>
> > Ok, I have no idea what that could do to the compression on cranking.
> > What does it rely on for 'demand'? It could be seeing high vacuum with
> > the throttle plate closed and be spinning up.
>
> Compression at idle/crank should be identical to a normally aspirated
> engine. (hard to type whle slightly buzzed) :D
>
> I foobared and didn't block the throttle open. Next time.
>
> > Meanwhile if you have no ping issues, then you have no issues.
>
> That's what I thought. Just wanted to get a basline and find out
> for sure if there wasn't a big ass leak causing the rough idle.
>
> --
> DougW