Interference engine, timing and MAF

weismc · Feb 23, 2004

Is the SR20 and interference engine (Ie. If the timing chain breaks do the pistons slam into the valves)?

Also, is there a way to check timing on a SR motor, I am used to pulling out the timing light clipping onto the first cylinder’s spark plug wire and shoot the crank pulley?

Were there different versions of the MAF? I got my motor complete except for a MAF, I bought one off of ebay and the connector from my harness does not fit the MAF connector. I am working on getting a picture of it but it has 4 connector spots and only 3 tabs inside of it, which match up to the connector, but the plastic housing does not fit.

Joel 180 · Feb 24, 2004

Is the main AFM tubing plastic or metal? If its metal its an SR or CA one. If its plastic its an R32/33 Z32 one.

unfrgivn · Feb 24, 2004

I keep hearing people swear that our car is a non-interference engine, HOWEVER, I am almost positive it is an interference engine. I have never taken an SR apart, so I couldn't tell you first hand, but I'm sure someone here has.

unfrgivn · Feb 24, 2004

And about the MAFS, you have a SOHC mafs. It will work, but you have to shave off the side that doesn't have a pin sticking out. Basically take a hacksaw and cut off the plastic wall right after the 3rd pin.

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weismc · Feb 25, 2004

Ahh.. thanks so much unfrgivn. I was so confused for so long as to what in the bejesus was wrong. Thanks for the help.
Anyone have anything on checking timing?

Nismo1182 · Feb 25, 2004

The CA is an interference engine, im sure the SR is also.

Joel 180 · Feb 26, 2004

Am i wrong is assuming cam belt engines are generally non-interference while chain engines are? Just stabbing in dark here.

weismc · Feb 26, 2004

I dont know about the belt drive engines being non-interferance. It may be true for Nissan, but i know that that does not hold when it comes to toyota engines. Just my experance??

unfrgivn · Feb 26, 2004

Yes in general belt = interference, chain = non-interference. However this is not always true as once again I believe the KA and the SR are both interference.

scir16v · Feb 27, 2004

I know from my expeirance with vw's that the 8 vale engines aren't and the 16v engines are. they are both belt driven. as for the ka and sr, ?

yellow_jacket · Mar 1, 2004

I know Honda's are belt driven and are definetely interferance. Same with Dodge Neon's. The Toyota 22-R is a chain driven motor and it is interferance. I know the old Stanza's are chain driven and are also interferance. It varies from motor to motor usually. It doesn't really have much to do with wether or not it has a chain or a belt.

MojaveRider · Mar 2, 2004

I am almost ashamed to admit, but i worked on the a 93 Protege with the 1.8L DOHC. It is a belt, and a non-interference. I know this because we had the timing belt on all wrong to the point where you could hear the lack of compression due to the intake valves being open during the compression stroke, and all the valves are fine.

I think it depends on the particular engine more than anything else.

apexipower321 · Mar 2, 2004

i have a problem with my sr20det it running rich real rich what should i do?

Joel 180 · Mar 2, 2004

get it fixed.

Judge · Mar 2, 2004

Joel 180 said:
get it fixed.

+1

Interference engine, timing and MAF

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