I'm running a DWR1 cam in my BJ8; about 250 miles so far. It pulls
smooth--even with a 3.54 rearend--from idle up to 4K RPM, but seems to
run out of breath much above 4,500 (not that I go there often anyway).
One thing that I noticed, and didn't expect, is that when I decelerate
in gear it seems to 'come off the cam' at about 2,500RPM or so; my
Mustang GT does this quite noticeably at about 1,800RPM, but it has
variable cam timing.
My engine builder commented on the light ring loading from my 85mm DWR
pistons; that, and their lighter weight and 3-ring design I believe
reduce internal friction quite a bit.
As (bad) luck would have it, I cracked my pan and had to pull it for
repair, so got a couple shots of the cam and pistons in situ.
Bob
On 5/12/2017 7:08 AM, Bruce Steele wrote:
>
> According to the DWR website, any of their cams other than the DWR1
> require releaving the pistons. My engine was just finished with a
> DWR1 cam with his bucket followers and lifters, and I?ve had a DWR
> high capacity oil pump for years. I also had DWR 85mm pistons
> installed. Unfortunately it is not yet back in the car so I can?t
> give you any driving impressions. You can talk to Dave Nock, though;
> he runs a DWR1 cam, as I recall.
>
> Bruce Steele
>
> Brea, CA
>
> 1960 BN7
>
> *From:*Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of
> *David Masucci
> *Sent:* Friday, May 12, 2017 4:06 AM
> *To:* Ahealey help <healeys at autox.team.net>
> *Subject:* Re: [Healeys] Selecting a replacement CAM for BJ8
>
> Hi all,
>
> A few weeks back I mentioned to the list that I?m considering using a
> Welch DWR8 cam. Based on responses and more research I think I will
> go with the DWR1 with the bucket followers and longer pushrods. I also
> plan to use the high capacity pump on my mostly stock engine.
>
> I was considering using the roller rockers, but am not sure if that?s
> going to make any significant improvement. I know it will buy a couple
> of ponies due to less friction, but is there any other significant
> advantage on a basically stock engine. Would I be wasting my money on
> something fancy that really has modest benefit? The DWR1 cam provides
> 0.252? cam lift. According to Welch, the valve lift with standard
> rockers would be 0.358?, and would not need pockets machined into the
> block. Based on the 1.65:1 ratio of the roller rockers, the valve lift
> will be 0.416?. I believe that will require pockets in the block.
>
> Does anyone have opinions on this combination? The roller rocker
> assembly is over $1200 not including getting into the US from the UK.
> Is there a better place in the engine to spend those dollars?
>
> Thanks all!!
>
> Dave
>
> 64 BJ8
>
> 72 XJ6
>
> 72 Bonneville
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://autox.team.net/pipermail/healeys/attachments/20170512/c2f131e2/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IMG_1235.JPG
Type: image/jpeg
Size: 123295 bytes
Desc: not available
URL:
<http://autox.team.net/pipermail/healeys/attachments/20170512/c2f131e2/attachment.jpe>
|