Irmscher Shorty Specs???

[philcav]

What is the opening diameter of the runners where the carb bolts on?

Will the Weber 45mm carbs fit as well as other side draft carbs (Solex, Dell'Orto)?

[GTJIM]

The ones I have are 40mm as-cast but I would suspect that Irmscher used to supply them in 40/45/48 mm sizes. Often 'ported' out bigger by owners though. The ones advertised in our classified section by Philcav look to be ground out to 45mm for instance. Now sold on eBay for $300 "BUY NOW" .....

[tekenaar]

Originally Posted by GTJIM The ones I have are 40mm as-cast but I would suspect that Irmscher used to supply them in 40/45/48 mm sizes. Often 'ported' out bigger by owners though. The ones advertised in our classified section by Philcav look to be ground out to 45mm for instance. Now sold on eBay for $300 "BUY NOW" .....

The vast majority of CIH engines are 1.9s, especially when considering the time during which these SSD and DSD manifolds were offered by Irmscher, Steinmetz and others. I may be wrong, but I can honestly say that I haven't seen anything other than 40mm "as-cast" SSD or DSD manifolds from any German "tuner" sources. I cannot comment with the same assurance on other sources . . . US, Italian or Swedish, etc.

[Jerry C]

Did I pay too much?

[RallyBob]

Originally Posted by willis Did I pay too much?

Depends on how much you paid. Back in 1984, I bought a set of new Irmscher shorties with the thermostat housing for $260 dealer cost direct from Irmscher.

Bob

[opelspyder]

No, I've seen them go for that, but hopefully you bought them for a GT due to clearance issues. Now my question:

Which is the Better choice,(Keep in mind clearance has no issues here) the shorty style irmsher dual side draft intakes, or the standard longer style that companies like Cannon produced? I guess I am looking for a decicion that would involve performance here. I would assume the longer would allow more air/fuel mixture to atomize???? What do you think
Keith

[RallyBob]

Originally Posted by opelspyder No, I've seen them go for that, but hopefully you bought them for a GT due to clearance issues. Now my question: Which is the Better choice,(Keep in mind clearance has no issues here) the shorty style irmsher dual side draft intakes, or the standard longer style that companies like Cannon produced? I guess I am looking for a decicion that would involve performance here. I would assume the longer would allow more air/fuel mixture to atomize???? What do you think Keith

I've done back-to back test with the Cannons and 40 DCOE's, and then with short Irmschers and DCOE's.

First of all, the Irmschers flow a bunch better out of the box.

Second, longer runners = better low end power and torque. Shorter runners equals better high end power with the torque peak raised to a higher rpm level.

Add these facts together, and the reaction is as expected: The Cannons are a bit better around town and have more torque down low. The Irmschers outright sucked in my opinion for low rpm driving (below 4500 rpms). A Weber 38 DGAS downdraft on a mildly ported stock intake outperformed it in normal use. 0-30 times were slower with the Irmschers compared to the DGAS, but they were a tad quicker 0-60. It was only from 0-100 and in top speed runs that the Irmschers started to shine. In other words, perfect for German autobahn driving.

Of course, in a GT the Irmschers are the logical choice for fitment issues with the heater box. For a Manta, Ascona, or Kadett, the best bet is to weld up and port the Cannons, add a phenolic spacer between the intakes and carbs, then run a set of long (4") ram pipes at the inlet. Torque will be awesome with this setup, and very driveable too. Example here.

Bob

[opelspyder]

Well the 4 more inches stick out a little too much for me (okay alot) I guess my thought on it is with my driving habits and show habits, it seems it just looks better to have the dual side drafts on there, well....because its cool!!! I know that adjusting and tuning them in is a bit more difficult though also. I am thinking of a setup on a Kadett Rallye. I don't even have the car, but I'm thinking of the game plan. Maybe fuel injection is a better route for me.
Keith

[RallyBob]

Originally Posted by opelspyder Well the 4 more inches stick out a little too much for me (okay alot)

No one said they have to go straight out! A lot of Italian tuners used 90-degree ram pipes for clearance. You can face them upwards, or tilt them up and forwards a bit. Check out the pic at the lower right part of this page.

Bob

[tekenaar]

Originally Posted by opelspyder Well the 4 more inches stick out a little too much for me (okay alot) I guess my thought on it is with my driving habits and show habits, it seems it just looks better to have the dual side drafts on there, well....because its cool!!! I know that adjusting and tuning them in is a bit more difficult though also. I am thinking of a setup on a Kadett Rallye. I don't even have the car, but I'm thinking of the game plan. Maybe fuel injection is a better route for me. Keith

Want something really unique and cool? How about the Rekord Sprint dual DFO intake, of which I am also going to use one in my '69 Kadett LS:



Jetting is already done for a 1.9/2.0 flat-top piston engine and I have my second one, bought several years ago on German e-Bay, listed here in the Parts for Sale Ads.

[tekenaar]

Originally Posted by willis Did I pay too much?

Too much is always relative and always dictated by supply and demand. These were never high volume items in the first place and even finding them today, so many years after their limited production, becomes the driving force behind pricing . . . and then there's "demand" to contend with on top of that. Rarity always seems to drive pricing up, but final price of anything is determined by just how much the buyer is willing to pay for the item at the time.

[GTJIM]

Originally Posted by willis Did I pay too much?

Look at it this way - you have a set of them .... and the people you bid against are still searching and wishing they had gone one more bid!

[opelspyder]

Otto, have you received my recent emails on the intake? I see there has been an email problem on this site, and I've tried to contact you twice in the last couple days. If not, I'm not trying to be pushy, just usually hear something from you
Keith
keithlundholm@yahoo.com