Fitting your adapter plate
You should have your adapter plate fitted by someone who is competent, This is a general rule of thumb. However there is also a few basic things to follow;
- Because of irregularities between castings, Dry fit your adapter plate to the intake with your hardware of choice, If the threads rub or bind file your manifolds holes till it fits freely. Do the same for the holes on the adapter plate to the cylinder head but this should not be needed. Consider porting your plate and intake to remove any irregularities in air flow. Please look online for how to do this or take it to a professional to do. Once modified or damaged the plates are not returnable. If the bolt holes or threads on your plate are more than 0.5mm out of place please notify us so we can investigate.
- Make sure your mating faces are clean and free of grease, carbon and old gasket material. Run a tap through your threads on the cylinder head to chase out any dirt and old locking agent. Wipe with degreaser or alcohol.
- Place your gasket of choice on the cylinder head, If using a paper gasket you may use a small amount of silicone or grease to tack it into place so it does not fall during fitment. Do not use excess amounts as you do not want it to squish into the intake runner where it could possibly get eaten by the engine.
- Fit the adapter plate without any of the studs for the adapted intake installed to the cylinder head with the supplied hardware (if your kit included it), Apply non permanent locking agent to the cap screws only. Start by putting in everything finger tight and make sure the fixings are not bottoming out prematurely.
- If using bolts for the remaining 5 holes on a non flush plate use spring washers or non permanent locking agent. Ensure they are not too long as they could damage the castings of your cylinder head. it is recommended that studs and prevailing torque flange nuts are used as they do not need locking agent and do not damage the face of the adapter plate.
- Progressively torque up the bolts/nuts starting from the middle outwards, This prevents the plate from not being seated properly or being warped. Start at 20nm on everything, then step up 5nm at time until the maximums below (use your professional judgement);
- Class 8.8 M8 should be torqued to maximum 30nm, Class 10.9 M8 should be torqued to maximum 40nm. If your unsure please torque up to 30nm only. If reusing old fixings please ensure they appear to be in good condition.
- Install your studs for the SR20 manifold of your choice finger tight only with non permanent locking agent. Check they have all seated most of their threads, if one is sticking out further than the others remove and and investigate why.
- On a 10mm plate not all of the threads will usually tap into the plate because the thread is slightly countersunk.
- If using bolts to fix your manifold to the adapter plate (not recommended), ensure the bolts are not too long. If they go through the plate too far they may warp it and cause it to leak. Make sure they use a spring washer or non permanent locking agent.
- Place your gasket for the SR20 intake and then fit your intake. Use the same method of fitting and tightening bolts as above.
- Check for vacuum leaks. You may do so at speed if your confident and ready to do so. Enjoy.