14 replies to this topic

[Daze]

Two quick questions for everyone here, please...

1/. How can I identify which pushrods are for what engine?

2/. How can I identify rocker assembly's?

I need to know for buying the above for my MG metro 1275 engine.

Thanks.

[Big_Adam]

Rockers are fairly standardised for all engines I do believe. I mean I have allegro 1300 rockers on my 998. Jus means moving a washer or two about to get the rockers to line up right.

Edited by Big_Adam, 25 January 2007 - 11:43 AM.

[Daze]

Cool, cheers. Pushrod's anyone?

[Guess-Works.com]

998's are shorter than 1275's

[Daze]

Hm. Cool!

Problem though, how can I compare shorter and longer ones if they are all the same size? Then I wouldn't know if the ones I am holding are "long" or "short"...

Does that make sense?

[Big_Adam]

your saying you have no comparison for pushrod lengths.

Hold on. I'll pop to my garage and measure up a push rod for you. 998 one. 2 sec.

*tic tock*

8 and 1/2 inch. For 998 just about.

Edited by Big_Adam, 25 January 2007 - 12:56 PM.

[Daze]

I'm assuming the worst. I don't have pushrods at my garage, but the guy I bought my engine from has a lot of them. I havent seen what he's got yet and I don't know if he has any 1275 and 998's, or just one or the other.

If i could know the size of just one, that would be awesome. Cheers.

There's no difference between A-series, A+?

[Big_Adam]

Do you mean a 1275 pushrod, as I posted a 998 push rod length. 8.5inch.

[Daze]

Excellent cheers. I'll measure the ones I've got. If they are longer than 8.5 inches, then I guess they are for 1275. If they are the same, then its 998!



Thanks!!

[Daze]

Just to update this a little, I got my hands on a set of 1275 push rods and measured them. They are 8.5 inches so I assumed they were not going to fit.

However, just out of interest I put them in the block and they seemed to be the right length. I've since put all of them in, and put the head on with the rockers and everything lines up right.

So, the push rods I am using are 8.5 inches long and fit perfectly in my MG Metro engine.

[JetBLICK]

I've had 1275 rods next to 998 ones and you can barely notice the difference. I think the difference is only a fraction to be honest.

When i put a 1275 head on my 998 i didn't think there was a difference in them, so i used the 1275 'rods. It was only after the motor went boom that i found out 998 'rods are actually shorter. Tho i still can't tell the difference, they look the same to me.

Edited by JetBLICK, 27 February 2007 - 01:39 PM.

[Daze]

Ah C**p! Fair enough. I know mine are from a 1275 GT block, so I can only assume they are going to work with my 1275 block! I hope!! |

[Big_Adam]

Well. .... .... as long as you can still adjust the tappet then I (personaly) can't see their being any ill effects apart from maybe at silly high revs (like 7000rpm) were the shorter ones might hold up slightly better with the higher revs. But thats more me rambling.

[Daze]

Awesome, cool. Thanks guys!

Damn there isn't a RESPEKT smiley so that'll do!!

[Bill USN-1]

Awesome, cool. Thanks guys!

Damn there isn't a RESPEKT smiley so that'll do!!

Well just to throw a wrench in this since I just swapped from a 1098 to a 1275...the 1275 pushrods are longer.
It's a big deal if you try to use the 998 push rod in a 1275. The adjuster screw will have to be screwed down to almost the end. This changes the pivot point and puts more stress on the rocker.
On my 1275 the pushrod would almost hit the side of the hole also.

I found some good info in the Visard book while researching this on my motor.

Now going the other way and installing the 1275 pushrods in a 998/1098...there may not be enough room to back the screw out for the adjustment.

I recommend matching the pushrod to the motor!!