PMO Insulator Set, 38mm CIS Injection — Porsche 911 (1974-1983 CIS) (PM-O924-0)
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PMO 38mm Carburetor Insulator Set, Phenolic — Porsche 911 (PM-O924-0)
Short answer: PMO PM-O924-0 is a 38mm phenolic composite carburetor insulator set that mounts between the cylinder heads and the intake manifolds, listed for the Porsche 911 (1974–1983, CIS-pattern heads). It cuts the heat that reaches the fuel, so the mixture stays steadier and vapor lock and hot-start trouble are less likely. Match the 38mm size to your head ports and manifold flanges before ordering.
Part numbers: PMO PM-O924-0
Vehicle Fitment
| Years | Vehicle | Notes |
|---|---|---|
| 1974–1983 | Porsche 911 (air-cooled) with CIS-pattern heads | For a PMO or Weber carburetor conversion on CIS-port heads; match port size and height to your build |
| Does not fit | 1965–1973 911 with carbureted or MFI-pattern heads | Use PMO's carbureted/MFI-pattern parts |
| Does not fit | 1984–1989 Carrera 3.2 and 964/993 3.6 (Motronic heads) | Use PMO's Motronic-pattern parts |
| 1975–1989 | Porsche 930 | Not confirmed; call us before ordering for a 930 |
The listing name refers to a CIS application; if your car is not carbureted, call us before ordering.
Specifications
| Specification | Detail |
|---|---|
| Part number | PM-O924-0 |
| Brand | PMO |
| Size | 38mm |
| Material | Phenolic composite |
| Package | Approximately 4-1/8 x 4-1/4 x 1-3/8 in |
| Shipping weight | 0.2 lb |
Why It Matters
Heat soak is what turns a crisp-running carbureted 911 into a hard hot-starter. Phenolic composite conducts very little heat and holds its shape in the engine bay, so the insulator keeps manifold heat away from the fuel in the carburetor.
It is a genuine PMO part, from the maker of the carburetors, and matches the original mounting for the listed application.
Installation Notes
- Mounts between the cylinder head and the intake manifold.
- Check that the 38mm size matches your head ports and manifold flanges before ordering.
Frequently Asked Questions
- Will the PMO PM-O924-0 insulator set fit my Porsche 911? It is listed for the Porsche 911 (1974–1983, CIS-pattern heads) in the 38mm size. Match the 38mm size to your head ports and manifold flanges before ordering.
- Does the PMO 38mm insulator set fit a Porsche 930? 930 fitment is not confirmed. Call us before ordering for a 930.
- What is a carburetor insulator made of? This set is phenolic composite, a material that conducts very little heat.
- What does a carburetor insulator do? It mounts between the cylinder head and the intake manifold and cuts the heat that reaches the fuel, which helps keep the mixture steady and reduces vapor lock and hot-start trouble.
- What is the part number? PMO PM-O924-0. The package is about 4-1/8 x 4-1/4 x 1-3/8 in and 0.2 lb.
Explore Related Categories
Porsche Parts · Porsche 911 · Air-Cooled Catalog
California Prop 65 Warning: This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. For more information, visit www.P65Warnings.ca.gov.
All parts legal for use on pre-pollution controlled vehicles only.
