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Streetracing.co.za • View topic - 20V Silvertop - to rebuild or get a new motor?
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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Mon Mar 02, 2015 10:01 pm 
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Local mad scientist
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aha.. yes then is the piston or rod, did you have them change rod length on them...?


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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Mon Mar 02, 2015 10:09 pm 
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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Mon Mar 02, 2015 10:19 pm 
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one can have a machine shop shave a mill or so from a rods length, by skimming the big-end cap and then re-boring to size, with the bore center slightly moved towards the other end, effectively shortening it a bit.


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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Mon Mar 02, 2015 10:25 pm 
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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 7:34 am 
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And another update. We stripped my old motor last night to get the rods out and compare them to the ones in the new motor. We measured the new motor's rods and low and behold, we found the issue - one rod is bent significantly (something I mentioned when I first saw it) and the others are all squiggly. The rods from my old motor are good, so we'll use them in the new motor. These other rods are a throw-away.

Now that we have sorted that out, we can start assembling properly. I just need to try and get a new clutch kit for the car as the old one seems to be on its way out so may as well do it while everything is out.

Back to the exhaust question from before:

Blacktop exhaust ports are 33mm. The standard 4-into-2 branch I had on the old motor measures 33mm inside diameter and then the downpipe comes out at 47mm. The other branch (also a 4-into-2) I got off the new motor is 37/38mm inside diameter on the runners and it will need a different downpipe most probably. The system I want to run will go into a 57mm pipe and then a box and after the box 63mm.

Which one of the branches will work best?

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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 8:12 am 
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I'd use the one with the slightly larger runners, they can do with a bit more breathing space, but not to much then you start loosing power again.

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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 8:35 am 
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You may also want to consider a button clutch from Norbrake in Boksburg if you are not already using one.

Speak to Gavin & he will sort you out, no need to send anything to them, just tell them that you want the 210mm clutch for the 4A-GE FWD setup & they will know what you are talking about & get the right centre piece for the clutch you need :thumb:

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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 9:39 am 
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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 9:42 am 
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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 9:59 am 
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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 10:07 am 
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or you can use this carrot. :)





I'm just joking... that clutch is kind of already promised to someone... but

you could just get another one off of ebay...


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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 10:17 am 
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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 10:37 am 
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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 10:41 am 
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if it's an 8bolt flywheel yes...


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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 10:44 am 
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210mm...the 200mm is for the Twincam 16v flywheel :thumb:

I am using the 210mm on my Twincam 16...but that's cos I have a blacktop flywheel which is 5.9kg...if you don't already have one, get a blacktop flywheel....or let #Rotor make an aluminium one for you.

#Rotor...for future reference, what does the Tilton setup like that set one back with the aluminium flywheel? That is a double plate setup right?

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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 10:54 am 
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the flywheel is R3500, it's a basket tipe, 8082 ALi, so you use it with an Auto Flex-plate, that holds the ring gear. Just bolt it down straight over it.

the clutch packs can be had off of Ebay for anything from R3800 to R4200++ exluding bribes and shipping of course.

a new OT2 Cerametalic plate from Summit is about R1200 before shipping. (comes to about 1600~1800 landed)
also it then has the correct spline for the toy gearbox..

The 28 at the back of the part number is the spline code... must be a "28" for it to be the correct 21x29mm spline


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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 10:58 am 
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'07 Citi .:R - The Daily - EX - No Comment


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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Wed Mar 04, 2015 11:34 am 
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with the 3 ceramic plates, yes a bit of a bitch that can bite... but with the cera-metalic plate, not much different from a normal clutch, feel, a bit stiffer, but you get used to it quickly...

of course the problem is, there is no slippage, so you can not just drop clutch on the line, it will brake things...


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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Sat Mar 07, 2015 5:33 pm 
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I'm still trying to figure out what to do with the exhaust headers - I have the standard one and the other one I got has a JASMA plate on it with the numbers "95E051 4A-G" on it. Would it be fine to run the standard downpipe with the larger diameter header?

See the pics attached of the JASMA branch.


Attachments:
File 2015-03-07, 17 29 49.jpg
File 2015-03-07, 17 29 49.jpg [ 122.44 KiB | Viewed 10004 times ]
File 2015-03-07, 17 31 51.jpg
File 2015-03-07, 17 31 51.jpg [ 167.76 KiB | Viewed 10004 times ]

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 Post subject: Re: 20V Silvertop - to rebuild or get a new motor?
PostPosted: Tue Mar 10, 2015 7:52 pm 
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rookie
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Got the button clutch from Norbrake today... We've again had delays due to work obligations, but we fitted the other Silvertop rods out of my old motor and now the pistons line up perfectly. Now it should be a straight and easy assembly. Just have to find the time.


Attachments:
7745bbdcdae862b011c96a9b9093b1da.jpg
7745bbdcdae862b011c96a9b9093b1da.jpg [ 178.02 KiB | Viewed 10893 times ]

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