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Search took 0.03 seconds. Search: Posts Made By: crummasel
Forum: 911 Engine Rebuilding Forum 08-26-2018, 05:50 AM
Replies: 7
Views: 1,721
Posted By crummasel
Assumed your engine is the original one and with...

Assumed your engine is the original one and with that aluminum it would be stable enough to overbore the spigots to accept 90mm P/Cs.

But with respect to originality i would rather go for a set of...
Forum: 911 Engine Rebuilding Forum 08-10-2018, 01:30 AM
Replies: 4
Views: 918
Posted By crummasel
Having measured a huge number of mag cases and...

Having measured a huge number of mag cases and found a majority of (standard) cases with deformed sunk in spigot bore faces i would refrain from overboring a 2.4 case unless it is a 7R with...
Forum: 911 Engine Rebuilding Forum 05-15-2018, 02:07 AM
Replies: 8
Views: 1,187
Posted By crummasel
Exactly my point and interesting discussion. ...

Exactly my point and interesting discussion.
Since the CIS sprays permanently onto the (mostly) closed intake valve i would expect the fuel to enter the combustion chamber in a more liquid state and...
Forum: 911 Engine Rebuilding Forum 05-13-2018, 08:31 AM
Replies: 8
Views: 1,187
Posted By crummasel
OK, to make it more clear, the first bowled...

OK, to make it more clear,
the first bowled piston came with the 2.4T CIS:
http://forums.pelicanparts.com/uploads26/mahle_24CIS_21526228615.jpg

vs. the previous domed ones used in carb or MFI...
Forum: 911 Engine Rebuilding Forum 05-12-2018, 02:06 PM
Replies: 8
Views: 1,187
Posted By crummasel
Good answer. I would agree ;) Back to the...

Good answer. I would agree ;)

Back to the question: What was the reason Porsche used bowled pistons for CIS and domed pistons for non- CIS (even with similar compression) ?
Forum: 911 Engine Rebuilding Forum 05-12-2018, 06:12 AM
Replies: 8
Views: 1,187
Posted By crummasel
Piston Dome Shape CIS vs. Carb

Hi there,

in an other thread the question came up if the CIS really needs the "bowled" piston shape. My understanding was that the turbulence induced by the special shape was used to create a...
Forum: 911 Engine Rebuilding Forum 05-12-2018, 05:47 AM
Replies: 13
Views: 2,247
Posted By crummasel
Hi Jason, i know the books as well as 911...

Hi Jason,

i know the books as well as 911 engines which i am doing power enhancements and rebuilds on since over 25 years.
I just left CIS aside due to its relatively low potential and its...
Forum: 911 Engine Rebuilding Forum 05-09-2018, 10:09 AM
Replies: 13
Views: 2,247
Posted By crummasel
Hi Jason, thanks for sharing and,...

Hi Jason,

thanks for sharing and, interesting.

So you consider non-"bowled" pistons not necessary for CIS use? My understanding was the special piston shape should help tumbling and fuel...
Forum: 911 Engine Rebuilding Forum 05-08-2018, 03:19 AM
Replies: 13
Views: 2,247
Posted By crummasel
2,7s CIS performance upgrade pistons and cams

Hi there,

i have got here a '77 2,7s Sporto i am planning to redo the engine.
Actually it is a 165HP with a pre '74 type SSI exhaust mounted so probably 175HP.

I am after a slight increase...
Forum: 911 Engine Rebuilding Forum 07-26-2017, 05:17 PM
Replies: 54
Views: 9,368
Posted By crummasel
Oh sorry, i admit to have sounded a bit...

Oh sorry, i admit to have sounded a bit generalising.

Just my experience of what i received and here its 100%.

BUT i absolutely do NOT believe that ALL US work is bad, not at all!

Maybe it...
Forum: 911 Engine Rebuilding Forum 07-25-2017, 04:42 PM
Replies: 54
Views: 9,368
Posted By crummasel
If i look to the pics you post here, heads are...

If i look to the pics you post here, heads are looking nice but valves seem to be cut much too deep. Could be an indicator that there is no good precaution to concentricity when changing valve guides...
Forum: 911 Engine Rebuilding Forum 12-21-2016, 04:40 PM
Replies: 7
Views: 1,155
Posted By crummasel
What Steve said. You want the bowl shape...

What Steve said.

You want the bowl shape dome for CIS.
If 2.4s are unobtainium (and your pistons are not reusable) i'd go for 2.7s
Forum: 911 Engine Rebuilding Forum 11-29-2016, 05:10 PM
Replies: 3
Views: 451
Posted By crummasel
Good. What do you think a 905 could be loaded...

Good.
What do you think a 905 could be loaded with assumed a projected mileage of -say- 500kkm one another hillclimb included?
(no experience with that drive at all and wanting to know the...
Forum: 911 Engine Rebuilding Forum 11-29-2016, 01:44 PM
Replies: 3
Views: 451
Posted By crummasel
Performance on 905 Sporto

Hi there,

actually i am thinking about combining a carbed 2.7 in an SWB with a 905 Sporto.
Anyone here who made real experiences with performing engines on a 905?

Too crazy?
Any known torque...
Forum: 911 Engine Rebuilding Forum 11-11-2016, 06:25 PM
Replies: 28
Views: 2,103
Posted By crummasel
Not that i wisch it were the reason but consider...

Not that i wisch it were the reason but consider also a loosened valve seat
Forum: 911 Engine Rebuilding Forum 07-02-2016, 05:32 AM
Replies: 13
Views: 1,351
Posted By crummasel
Are you sure your jaw chuck really runs true? ...

Are you sure your jaw chuck really runs true?
To measure valve truth and roundness i would rather use a collet chuck on a lathe...

The one valve having a dark area on its seat surface may really...
Forum: 911 Engine Rebuilding Forum 03-31-2016, 11:06 AM
Replies: 13
Views: 1,687
Posted By crummasel
I am using them since 20 years on a big number of...

I am using them since 20 years on a big number of engines made. Never had any issues.
Forum: 911 Engine Rebuilding Forum 03-17-2016, 04:10 PM
Replies: 7
Views: 729
Posted By crummasel
#1 Open it up at least to 30mm (which can be...

#1 Open it up at least to 30mm (which can be machined out of the original venturies on a lathe if the operator has a "sense" for fine mechanics), and build your new jetting based on that.
#2 REALLY...
Forum: 911 Engine Rebuilding Forum 02-08-2016, 03:01 PM
Replies: 19
Views: 1,833
Posted By crummasel
What Bruce said. At least you know you have a...

What Bruce said.
At least you know you have a limited time window when using 574.
But its doable as long as you work quickly and concentrated.
So lock the door and but the telephone into the...
Forum: Porsche 911 Technical Forum 02-07-2016, 05:03 PM
Replies: 13
Views: 1,493
Posted By crummasel
Hi Chris, could you please explain what parts...

Hi Chris,
could you please explain what parts you have for the TINs in terms of emulsion tubes (variants, usage etc..).

Also what parts in general

Thanks and greets,
Robert.
Forum: 911 Engine Rebuilding Forum 01-29-2016, 01:29 PM
Replies: 4
Views: 1,009
Posted By crummasel
Correct, there are better options but when budget...

Correct, there are better options but when budget is a topic mentioned set definitely is considerable. Indeed they are astonishingly good given the price.

Re mag cases there is some risk they are...
Forum: 911 Engine Rebuilding Forum 01-28-2016, 04:26 PM
Replies: 4
Views: 1,009
Posted By crummasel
If you are restrictive on budget i would take...

If you are restrictive on budget i would take 86mm P/Cs like Porsche 911 86mm JE Piston & Cylinder Kit 2.2 & 2.4 | eBay...
Forum: Porsche 911 Used Parts For Sale & Wanted 12-15-2015, 03:54 PM
Replies: 20
Views: 955
Posted By crummasel
c'mon guys, nobody?

c'mon guys, nobody?
Forum: Porsche 911 Used Parts For Sale & Wanted 09-13-2015, 02:11 PM
Replies: 20
Views: 955
Posted By crummasel
still looking...

still looking...
Forum: Porsche 911 Used Parts For Sale & Wanted 09-06-2015, 03:22 PM
Replies: 20
Views: 955
Posted By crummasel
uup

uup
Showing results 1 to 25 of 175
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