opinions on engine needed
Pro
Joined: Jan 2004
Posts: 535
Likes: 1
From: Darwin, Australia NT
If you get that 240/248 cam ground on a narrower lobe separation angle you have a higher dynamic compression. I use a 244/248 on 109 sep angle, on a 10.4/1 355. sure it has a bit of a ratty idle but the mid range is awesome.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
I was thinking of a 278/288 at .0200 tappet and 246/256 at .050 with lca of 112,5° and lift in the range of .58-.60. The springs provide enough space to allow these lifts. I would still have a DCR about the same as I have now.
Intermediate
Joined: Apr 2007
Posts: 38
Likes: 0
From: Baltimore MD
Aside from the induction system, I just want to say bravo for going big bore and short stroke. I rarely find anyone that wants to go small cubes anymore. Nothing wrong with big engines as that seems to be about all I do these days but I do like the higher RPM power with the short stroke.
You do need more camshaft and compression though to make this a screamer.
You do need more camshaft and compression though to make this a screamer.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Aside from the induction system, I just want to say bravo for going big bore and short stroke. I rarely find anyone that wants to go small cubes anymore. Nothing wrong with big engines as that seems to be about all I do these days but I do like the higher RPM power with the short stroke.
You do need more camshaft and compression though to make this a screamer.
You do need more camshaft and compression though to make this a screamer.
So last couple of days I started looking at a higher intensity cam. In the crane catalog only the race cams have high enough intensity, but the are all ground at a LCA of 106° which creates alott of overlap and thus bad performance on the low end. With the camfigures stated above, I would have the valve close at the same point as my current cam, create more lift and higher .050" numbers with a 112,5° centerline. Basically the engine would have the same low end power and vacuum/idle qualities, but would breathe to around 7500 rpm in my opinion.
I will see what Crane says and how much this cam is going to cost.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
update
Well, I finally had Crane put out a price on the custom cam and I'm going this way. It has 063" lift and a lott more opening at 0.05" so I should get over 7000 easily. The opening and closing rates are a lott higher so maybe there is a bit more valvetrain wear.
