What the heck caused this?? Bent butterflies....

[wood_e]

Ok guys here's an interesting one for you... my intake has never been completley dismantled before. I tackled the task today and found something really odd....

2 of the 3 butterflies on the plennum closest to the front of the car are BENT! All the rest of them are fine. What caused this? How can I remedy this? Should I carefully hammer them straight?

 

[shopartsnw]

I have seen that before in some of the cores we used to build the big bore butterflies. I don't know what caused it.

The stock butterfly plates are pretty soft, you should be able to bend it back with your fingers. Worst case, if you needed a new plate, let me know, I have about a billion stock plates from Kurt's last couple runs.

- Mike

 

[yamahaSHO]

Have you had any type of intake backfire?

 

[sdpatt]

That condition can be caused by a severely premature ignition of the mixture in the cylinder with the intake valves still open. In other words, a backfire. Incorrect routing of the spark plug wires is probably the simplest way to accomplish this. Remember Artesia? He created a case very similar except that his butterflys were so bent the secondaries wouldn't fully close or open.

 

[yamahaSHO]

Remember Artesia?

You had to bring him up...

Just messing with you Scott

 

[wood_e]

Have you had any type of intake backfire?

Ever since I've owned the thing I doubt I have had a backfire. I dunno about the pervious owner... anyway good points! I never would've thought of backfire but that makes a lot of sense.