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cam regrind

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Postby strx7 » Tue Jan 04, 2011 9:20 am

3 litre v6 camry or windom
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Postby dnalunchie » Tue Jan 04, 2011 9:25 am

Nar.... I need boost or lots of revs.
EX:89 RS and GT Legacys, 90 EF9 Civic, 95 Integra R, 95 AE101, 90 ST185, 88 Accord, 87 3rdoor and 5door Swift hatch, 91 Pontiac Lemans, 80 Liftback Celica, 95 Hornet 250
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Postby cogent » Tue Jan 04, 2011 9:29 am

dnalunchie wrote:Nar.... I need boost or lots of revs.

http://www.trademe.co.nz/Trade-Me-Motor ... 715500.htm
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Postby dnalunchie » Tue Jan 04, 2011 9:37 am

No rotangs.
EX:89 RS and GT Legacys, 90 EF9 Civic, 95 Integra R, 95 AE101, 90 ST185, 88 Accord, 87 3rdoor and 5door Swift hatch, 91 Pontiac Lemans, 80 Liftback Celica, 95 Hornet 250
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Postby strx7 » Tue Jan 04, 2011 10:29 am

dnalunchie wrote:Nar.... I need boost or lots of revs.


combine the 2 and you have fun times indeed.
Online Car Forums - Where Hui seems to take preference over Do-ey

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Postby Mr Revhead » Tue Jan 04, 2011 11:08 am

cogent wrote:
dnalunchie wrote:I am having performance car withdrawel issues. I need boost or revs or something!


lend you my rx7 for a week in exchange for a hoon on ya sis?


This deserves another quote :twisted:
Being the subject of E-whinges since 2004 8)

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Postby Bling » Tue Jan 04, 2011 11:30 am

He must be damn keen as swapping a weeks use of a RX7 for his 30 seconds of fun doesn't sound like good value to me :lol:
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Postby h8wrxs » Tue Jan 04, 2011 11:58 am

aparently i missed the joke then....
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Postby Bling » Tue Jan 04, 2011 12:32 pm

Wooooossssshhhhhhh

The sound of the joke flying above ya
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Postby cogent » Tue Jan 04, 2011 3:06 pm

BZG|Bling wrote:He must be damn keen as swapping a weeks use of a RX7 for his 30 seconds of fun doesn't sound like good value to me :lol:


;D ;D
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Postby Mr.Phreak » Tue Jan 04, 2011 3:29 pm

Mmmmm pie
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Postby pc » Tue Jan 04, 2011 7:49 pm

Here's the dyno plot of the regrinds in my bluetop.
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The bottom line is a stock bluetop on cold air box & bigger exhaust. The top line is another bluetop on the same intake & exhaust with the cams, 0.8mm head gasket, adjustable cam wheels tuned, and a bit skimmed off the head. Compression ratio is about 11.3:1. It was 91KW before the cam wheels were adjusted.
The valve caps (sitting under the buckets) make up for the reduction in base circle on the cams.
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Manfield - 1:24s
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Postby Bling » Tue Jan 04, 2011 7:59 pm

cogent wrote:;D ;D


Hah, makes a lot of sense now :lol:
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Postby Flannelman » Tue Jan 04, 2011 8:13 pm

When a cam is "reground", the base circle is ground away by a certain mesurement.

To increase lift by 2mm, the base circle is ground down 2mm. This also raises the duration of the cam to a given degrese. If the valvetrain has no way of taking up this 2mm in lash, then very expensive things need to be done to set the lash - offsetting the price of a regrind.

I dont know anything about a Suzuki Swift engine, but if it has the adjustment it could be worth looking at the price for a regrind. If not, dont bother.
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Postby strx7 » Tue Jan 04, 2011 9:00 pm

they have rockers with threaded adjusters so wouldn't cost anything to set up
Online Car Forums - Where Hui seems to take preference over Do-ey

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Postby MAGN1T » Tue Jan 04, 2011 9:52 pm

Flannelman wrote:When a cam is "reground", the base circle is ground away by a certain mesurement.

To increase lift by 2mm, the base circle is ground down 2mm. This also raises the duration of the cam to a given degrese. If the valvetrain has no way of taking up this 2mm in lash, then very expensive things need to be done to set the lash - offsetting the price of a regrind.

I dont know anything about a Suzuki Swift engine, but if it has the adjustment it could be worth looking at the price for a regrind. If not, dont bother.


Expensive things?

They're called washers (in the case of hydraulic lash adjusters).

If it's got buckets, then even a new cam will need to be re shimmed anyway so it's no difference either way.

Steve
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Postby levinguy » Tue Jan 04, 2011 10:01 pm

Flannelman wrote:When a cam is "reground", the base circle is ground away by a certain mesurement.

To increase lift by 2mm, the base circle is ground down 2mm. This also raises the duration of the cam to a given degrese. If the valvetrain has no way of taking up this 2mm in lash, then very expensive things need to be done to set the lash - offsetting the price of a regrind.

I dont know anything about a Suzuki Swift engine, but if it has the adjustment it could be worth looking at the price for a regrind. If not, dont bother.


i thought when they had a bucket setup, when they reduced the base circle of the cam, they made up for this by lengthing the valve, and this was where people criticized regrinds as being only as good as the person who had lengthed the valve.
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Postby strx7 » Tue Jan 04, 2011 10:18 pm

how can you easily lengthen a valve?? youd need to pull the head off, disassemble it all, find some longer valves, balh blah blah.
Online Car Forums - Where Hui seems to take preference over Do-ey

HDJ81- 112AWKW @ 10psi), FC3S (Tarmac Spec 335rwhp@11psi), 3SGTE stroker - replacement body found.

Motorsport Bay of Plenty - http://www.mbop.org.nz
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Postby levinguy » Tue Jan 04, 2011 10:20 pm

strx7 wrote:how can you easily lengthen a valve?? youd need to pull the head off, disassemble it all, find some longer valves, balh blah blah.


they weld to the existing valve.

and how was it supposed to be easy?

i duno, im only going on what i've been told from people who do this all day everyday when i got some cams done for my head....
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Postby pc » Wed Jan 05, 2011 10:19 pm

As I said earlier, install valve caps, they come with the regrind price.
No welding or expensive stuff to be done, just sit them over the end of the valve stem and it magically gets longer :lol:
red car
1/4 mile - 14.683s @ 91.83mph
Manfield - 1:24s
Taupo - Track1 1:53s (road tyres) - Track2 1:22s - Track3 48s (with esses) - Track4 1:58s
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