Quote:
Originally Posted by Cristián
Thanks for the answers!!, I´m constantly reading and learning about cars and engines and this kind of experiences are very helpful.
Well, I´ll try to answer the questions. First of all, the cam change is oriented and hopefully "matched" to the new heads we´re going to use, a set of 64cc camel hump fully ported with big valves. Actually our cam is capable to spin 6500 rpm with a set of 72cc heads, ported by my brother and myself.
Valve springs will be changed for a set recommended for the chosen cam, and so with the others parts that we´ll have to buy.
"What don't you like about your current set up?"
Just tryin to upgrade according to the budget. The current set up for our 350ci is very basic: flat top hyp pistons overboared to 4.040, stock rods and crank, 2800-6400 crane cam and heads a little bit worked.
Gear ratio is 3.42, 4 speed transmission, 265/50/15 tires.
"Why the change?"
Because it would be the next "cheap" upgrade. Forged internal, and full roller set are my wet dream right now, but my pockets are pretty empty haha, so I thought that a cam change should help me.
Hope you can help to make my decision. The car is used to keep my inner balance and my head clean, don´t use it everyday so daily driving is not a big issue, besides, I love agressive idle sound.
Muchas gracias guys,
Cristián Urrutia.
https://www.youtube.com/watch?v=qITAw_LIx2g |
Cristian --
Change your gear ratio -- the cam you're talking about should have fairly decent gears - and that's a cheap fix. That and spinning a stock bottom end 350 beyond 6500 is already asking for a windowed pan/block. A decent rear end gear change would wake the car right up - it might kill your cruising speeds but if you want good seat of the pants feel/change on a budget - gears would do it.
Right now @ 6500 your top speed (calculated) is 143 mph -- you could go to a 4.11 gear and change nothing else and you're top speed (calculated) would be 119.5... that's still 120 mph but buddy would you get there a whole lot quicker!! 3.70's would give you top speed of 132...