Search found 533 matches

by storm
Mon Feb 19, 2018 12:45 am
Forum: General Tech
Topic: Oil Filters
Replies: 3
Views: 2930

Re: Oil Filters

Just seen this topic and found it interesting. In Australia most of the filters are made by the one company and "branded" with other companies logos etc. There really isn't a difference between a GM PF-10 and a Ryco Z30 because they are one and the same. Likewise there really is no difference betwee...
by storm
Tue Feb 13, 2018 2:06 pm
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1196

Re: 454 efficiency - Maximum CR

Hmm. I think I didn't explain my theory very well. I understand velocity is important, and going to a very large port isn't the best idea for a street driver, no matter what fuel is used. What I meant was maybe a bit more volume in the port might be a good thing to allow 'room' for a mixture that s...
by storm
Sun Feb 11, 2018 10:08 pm
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1196

Re: 454 efficiency - Maximum CR

If petrol was "atomised" thoroughly you would find it would "take up more space" that it does already. LPG already being a vapour (in mixer systems as it enters the mixer) is already "atomised" mixing with the air stream, and cannot fall out of suspension like petrol can (and does with certain combi...
by storm
Sun Feb 11, 2018 5:07 am
Forum: Propane Forum
Topic: Whats wrong with this turbo setup?
Replies: 5
Views: 62

Re: Whats wrong with this turbo setup?

In general terms on a naturally aspirated engine you need 1.5 cfm/hp so a carb that flows 450 cfm should (when all else is equal) be able to flow enough air to help produce 300 hp. Forced Induction is just a matter of doing some more maths. For fuel flow take a look at the link in my signature. I kn...
by storm
Thu Feb 08, 2018 9:30 pm
Forum: Propane Forum
Topic: Exhaust valve rotators
Replies: 2
Views: 47

Re: Exhaust valve rotators

Just to add to what C3H8 has said I'll say "keep them" as well. Why? well simply because during normal engine operation valves, especially exhaust valves, go through a continuous process of "mini" welds between the valve and valve seat. Each time the "weld" occurs it is broken by the valve reopening...
by storm
Wed Jan 24, 2018 5:09 am
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1196

Re: 454 efficiency - Maximum CR

Welcome back Port velocity is directly related to a couple of things, 1. Engine size, 2. Stroke. Mix and match them well and you'll have a killer street combination. 2 engines of the same family, e.g 305 and 400 SBC, fitted with the same heads will have different port velocities purely because of th...
by storm
Sat Jan 20, 2018 11:07 pm
Forum: Messages
Topic: Site Down on 2018-01-11 to 15
Replies: 3
Views: 73

Re: Site Down on 2018-01-11 to 15

There is a wealth of information on here so it is no surprise that there are alot of visitors, who lurk and gather information from posts scattered throughout the forum, that don't join or post.
by storm
Fri Jan 05, 2018 6:44 pm
Forum: Propane Forum
Topic: F350 1995 5.8L LPG conversion Need HELP!!!
Replies: 1
Views: 63

Re: F350 1995 5.8L LPG conversion Need HELP!!!

Have you got pictures of the engine? I'm not saying your wrong but I have never seen a TBI system on a Ford V8 in an Effie. A question for you that will help me to answer the timing question. 1. What ECU is the vehicle fitted with (e.g. EEC-IV, EEC-V, something else)? If it is an EEC ECU you may be ...
by storm
Tue Jan 02, 2018 9:44 pm
Forum: Propane Forum
Topic: Impco 600
Replies: 8
Views: 137

Re: Impco 600

Will a 600 accept a Holley, or any other carburettor, baseplate like a 425 does?
by storm
Mon Dec 25, 2017 1:01 am
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1196

Re: 454 efficiency - Maximum CR

On a decent load bearing dyno part throttle testing isn't as difficult or time wasting as some may think. Most performance videos do just do WOT dyno pulls but I'm pretty sure most reputable tuning shops will do part throttle testing as well. Yes heads play a very important part in part throttle and...
by storm
Sat Dec 23, 2017 8:50 pm
Forum: Propane Forum
Topic: New timing chain set installed
Replies: 2
Views: 61

Re: New timing chain set installed

Any change in fuel consumption?
by storm
Wed Dec 20, 2017 11:47 pm
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1196

Re: 454 efficiency - Maximum CR

There is quite a big difference between the Pontiac 455 and the BBC. The major difference is the stroke with the Pontiac 455 having a 4.21" stroke and the Chev 454 having a 4" stroke. Pontiacs were never designed to rev, unless of course we start discussing the Trans Am 303 with a 2.840" stroke, but...
by storm
Tue Dec 19, 2017 9:53 pm
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1196

Re: 454 efficiency - Maximum CR

Traditional BBC exhaust ports are to big compared to the intake so the cams are smaller on the exhaust side than an engine whose intake/exhaust flow % are better. The exhaust side of the cam for the Vortec would possibly need to have a longer duration than traditional BBC cams to take advantage of t...
by storm
Tue Dec 19, 2017 7:21 pm
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1196

Re: 454 efficiency - Maximum CR

I've been doing some reading on BBC Vortec heads. From what I can tell they are between peanut and oval port in intake size and can be made to flow quite well. The exhaust is better designed so it flows less volume but faster which is good for torque as it evacuates the cylinder more efficiently. Vo...
by storm
Mon Dec 18, 2017 6:07 pm
Forum: Propane Forum
Topic: 454 efficiency - Maximum CR
Replies: 72
Views: 1196

Re: 454 efficiency - Maximum CR

There are oval port tunnel rams around, the Edelbrock 7115 is an example but they are matched to certain head types such as early or late but not both. Manifolds like these work well with LPG but aren't great for petrol.